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Bad Alternator Vs Bad Battery Vs Bad Starter

Author: Apogeeweb
Date: 15 Apr 2022
bad battery



Ⅰ Alternator & Battery & Starter

    1.1 What Does the Alternator Do?

    1.2 What Does the Car Battery Do?

    1.3 What Does the Starter Do?

Ⅱ Bad Alternator Vs Bad Battery Vs Bad Starter

    2.1 Bad battery

    2.2 Bad starter

    2.3 Bad alternator

    2.4 Bad Alternator Vs Bad Battery Vs Bad Starter|Symtoms and Solutions

Ⅲ How to Determine If an Alternator or Starter or battery is Bad

    3.1 Bad Alternator vs. Bad Battery

    3.2 6 Bad Battery Symptoms

    3.3 5 Bad Alternator Symptoms

    3.4 Signs of Possible Need for Starter Repair

    3.5 A Simple Solution To Alternator Or Battery Issues

    3.6 How to Determine If an Alternator or Starter Is Bad

Ⅳ Bad Alternator and Bad Battery Effects

Ⅴ Common Causes of Car Battery Failure

Ⅵ Risk of Driving with a bad alternator or battery

    6.1 Risks of Driving with a Bad Alternator

    6.2 Risks of Driving with a Bad Battery

Ⅶ 5 Tips for driving longer with a bad alternator

Ⅷ How Long Does An Alternator or A Battery Last?

    8.1 How Long Does An Alternator Last?

    8.2 How Long Do Batteries Last?

Ⅸ How To Check Your Battery Or Alternator?

    9.1 How To Test Your Alternator?

    9.2 How To Test Your Battery?

Ⅹ FAQs On the Alternator and Battery

    1. Can A Vehicle Alternator Charge A Battery Bank?

    2. How Long will a Battery Last with a Bad Alternator?

    3. Will a Bad Alternator Kill a New Battery?

    4. How do you tell if it’s your alternator or your dead battery?

    5. Will an alternator charge a dead battery?

    6. Can I disconnect a battery with the engine running to test the alternator?

    7. How can I prevent my alternator from failing in the future?

    8. Will A Dead Battery Damage My Alternator?

    9. Is it possible to jumpstart a car with a bad alternator?

    10. How Much Does A New Car Battery Cost?

    11. How Much Does A New Alternator Cost?

    12. How much does it cost to replace alternator?

    13. Is It Worth Tt Fixing A Broken Alternator?

    14. How Do I Know Which Battery To Buy For My Car?

    15. Do I need a new battery after replacing alternator?

    16. Is it safe to drive with a bad alternator?

    17. Why is my new alternator not charging my new battery?

    18. How long will a car run without alternator?

    19. How far can I drive with a dead alternator?

    20. Do alternators fail suddenly?

Final Thoughts


We've all been in an automobile situation when we tried to start the engine but it wouldn't start. This does not indicate a problem with the engine, but rather with the battery or alternator. But which of them is it? People frequently misdiagnose their power problems, believing they have a poor battery when, in fact, they have a faulty alternator or vice versa. If your automobile won't start, it's most likely due to a problem with the battery or alternator. When you narrow it down to those two alternatives – bad alternator vs bad battery – you have a 50/50 probability of getting it right. But you don't want to take a chance. You want to do it correctly the first time. Knowing the difference between the symptoms of a bad alternator vs a bad battery is critical since it can dramatically enhance your chances of getting your car started while avoiding other difficulties. So, how can you know which one is stopping your car from starting, and how can you avoid changing the erroneous part? Let's have a look at a couple of methods for determining which components are causing this issue.

Dead Battery Alternator Starter Test

Ⅰ Alternator & Battery & Starter

1.1 What Does the Alternator Do?

The alternator is a critical part of your vehicle's electrical system. The alternator turns the energy generated by the crankshaft into usable electricity. It charges the car's battery by supplying energy to it. The battery powers the vehicle's starting system as well as all electrical accessories.

If the alternator has a problem, it will not convert the energy in the crankshaft into electricity. As a result, even when the car is running and the crankshaft is producing energy, the battery will not receive an energy source. This would imply that the battery is not being recharged.

When the battery's charge runs out, it will no longer be able to produce the necessary electricity for the car to start or run any of its electronics. Before the battery is completely exhausted, your vehicle may begin to exhibit unusual behavior. Flickering headlights and/or weird noises while driving are examples of this. You may misinterpret these as indicators of a dying battery, which is possible.

1.2 What Does the Car Battery Do?

The primary function of your automobile battery is to start the vehicle. Alternators are powered by a pulley system linked to your engine. Unfortunately, this implies that if your automobile is turned off, your alternator will not produce any energy.

This is where automobile batteries come into play. The automobile battery will provide the initial energy required to start the vehicle. While the alternator provides the energy needed to operate the automobile and recharges the battery so it can start the next time it is shut off.

The battery also regulates the amount of energy or power required by your car to run. This guarantees that each component receives the correct quantity of power.

1.3 What Does the Starter Do?

The starter gets its power from the battery and is responsible for starting the engine when you turn the key or press the start button. That energy is required to turn on the engine and start the vehicle. Simply, you're not going anywhere if your starter isn't working properly.



Ⅱ Bad Alternator Vs Bad Battery Vs Bad Starter

2.1 Bad battery

A car battery should have a lifespan of four to five years. It is not designed to store a charge for so long, thus it is recharged while driving by the car's alternator. The interior metal elements of a battery corrode with time, diminishing its ability to store a charge. A battery is essential for your automobile or truck because it powers the starter and electrical system while the vehicle is not running.

Begin your investigation with the most typical cause of a car not starting: the battery. Those components, like all auto parts, have a limited lifespan. And they are subjected to a significant amount of abuse on a daily basis.

2.2 Bad starter

When you try to start the engine, you will hear grinding and whirring noises from under the hood. This is a sure sign of a bad starter. Sometimes the engine will start after a few moments, but those are the only sounds you'll hear when you expect your engine to start.

The starter solenoid (also known as a starter relay) links the battery to the starter motor.

What are the other warning signs of a broken alternator? When you try to start the engine, only the dashboard lights illuminate while the engine remains dead. You don't need to look any further: your car's starter needs to be repaired or replaced.

2.3 Bad alternator

A faulty alternator should be the final item to inspect out of the three most prevalent faults that cause automobile starting troubles. When you start your car, do the headlights decrease or flicker? Or, if you've just jumpstarted your car, does the engine shut off as soon as you unhook the jumper cables? If you responded yes to either of those questions, your alternator is unable to charge your vehicle's battery. And it must be repaired or replaced as quickly as feasible.

When the engine is running, an alternator charges the battery and powers the electrical system. When you start the engine, some newer vehicles will additionally display a battery-shaped warning light or "ALT" on the dashboard. Use that indicator as a caution to go to your nearest reputable auto shop and have your alternator repaired or replaced.

2.4 Bad Alternator Vs Bad Battery Vs Bad Starter|Symtoms and Solutions




Bad Battery

Engine won’t crank over and makes clicking noises when trying to start the vehicle

Recharge the battery

The engine requires numerous starts before engine cranks over

Check battery terminals for loose connections; replace if the battery is aged

The engine requires frequent jump starts

Replace the battery

No lights, no clicking noises when starting the vehicle

Jumpstarting is needed as the battery is dead; battery may require replacement

Bad Starter

Grinding noises when attempting to start the engine

Starter motor needs repair/replacement

Whirring noises when starting vehicle but engine won’t crank over

Starter motor needs replacement

Vehicle’s dashboard lights are on but the engine won’t turn over

Starter motor needs repair/replacement

Bad Alternator

Flickering or dimming headlights while the engine is running

Alternator needs repair/replacement

The engine dies immediately after jump-starting

Alternator needs repair/replacement

Dashboard light appears with “ALT” or battery icon

Alternator needs repair/replacement


Ⅲ How to Determine If an Alternator or Starter is Bad

If your vehicle won't start, the most common causes are a fading or dead battery, loose or corroded connecting cables, a broken alternator, or a problem with the starter. It can be difficult to tell whether you have a battery or an alternator problem. Here's how to figure out which one is to blame.


If your car won’t start,the common indicators listed above should assist in determining what is wrong.

If you don't want to do your own diagnostics, obtain a jumpstart (and keep your vehicle going) and take it in to have your electrical system checked by an expert. The starting and charging mechanisms should also be checked.

Battery tests on conventional wet-cell batteries should involve checking the fluid level, the posts (the terminals labeled + and -) for corrosion, and the cables for a snug fit and no corrosion.

The shop should also inspect the alternator's voltage and current output, as well as look for evidence of faulty diodes, which are the components that convert electrical current from AC (alternating current) to DC (direct current) (direct current). If it's time to replace it and your car has been customized with power-hungry aftermarket items like a music system, ask if a larger-capacity alternator is required.

If the alternator is working properly, the investigation will shift to other components of the starting and charging system.

3.1 Bad Alternator vs. Bad Battery

Even though they serve different functions, the alternator and battery rely on one another to keep the car running. The alternator provides charges to the battery to refill the electrical charges that have been depleted, while the battery assists the ignition in turning on the engine and distributing electricity to other electrical components. Either one of them failing can cause the car to fail. Here are several methods for determining whether the problem is with the alternator or the battery.

3.2 6 Bad Battery Symptoms

If your motor won't start, the automobile battery is frequently the first thing to go.

However, before you get your jumper wires, be sure it's the battery that's causing the issue.

Here are some warning indicators to look out for:

1. Dim Dashboard Lights Or Headlights 

When the engine is turned off, the battery powers all of the vehicle's electrical accessories.

Start the engine and look at the dashboard light symbols.

Do they have any lights?

This is a quick technique to see if the automobile battery is charged before starting the engine.

Turn on your headlights.

Are they dim or do they not light up at all?

A faulty battery will result in dim dashboard lighting or headlights.

A dead battery will not illuminate anything.

2. Slow Engine Start Or No-Start 

If your engine won't start or takes much longer than usual, it's time to pull out the jumper wires and try a jump-start.

If your motor starts and stays running but then won't start again, it's most likely a battery issue. If your vehicle quickly stalls, it is most likely due to a faulty alternator.

NOTE: Make sure the negative battery wire does not connect to the dead battery's negative terminal (this is a typical mistake!). Clamp it to the deceased car's unpainted metal surface. More information can be found in our dead battery guide.

3. Battery Corrosion

Corroded battery terminals obstruct electrical energy, preventing the car battery from charging properly.

Extensive corrosion may necessitate professional assistance or perhaps a battery replacement.

Check for rusted or frayed battery wires as well.

4. It’s An Old Battery The typical automotive battery has a lifespan of 3-5 years; the older the battery, the less capable it is of holding a charge. Older, failing batteries can acquire more corrosion as a result of leakage, resulting in a loss of charging capability.
5. There’s An Odd Smell A leaking lead-acid battery will generate sulfuric vapors, giving off that strange, rotten egg odor. Replace your automobile batteries as soon as possible if it is leaking.
6. A Warped Battery

In severe temperatures, battery swelling is common when internal fluid and parts expand. If your car battery is bloated, twisted, or distorted in any manner, it should be replaced.

If you're experiencing none of these six problems, a faulty alternator could be to blame.

Tip: If troubleshooting becomes too time-consuming, use a mobile mechanic.

3.3 5 Bad Alternator Symptoms

If the previous steps show that the battery is operational, it's time to investigate the alternator. There are certain bad alternator symptoms to watch for; learn how to identify if your alternator is bad here:

  1. Turn off the inside lights. While driving, take note of the brightness of the inside lights. The alternator is most likely to blame if the dashboard gradually dims.
  2. Headlights that are too dim or too bright. Do you notice how your headlights become brighter as you accelerate and dim as you come to a stop? This is frequently caused by the alternator failing to keep the battery fully charged.
  3. Growling sounds Before the trouble started, did you hear a growling sound? This can happen before an alternator fails.
  4. The odor of burning rubber or a hot wire. Is there any evidence that your alternator is overheating, such as the odor of burned rubber or hot wires? If this is the case, it is time to replace it.
  5. Examine the alternator. To test the alternator, some people advocate running the engine with the negative battery cable unplugged. However, this is not a good idea because it could harm your vehicle's electrical system and cause even more problems. Learn how to test an alternator.

3.4 Signs of Possible Need for Starter Repair

When the engine should be starting, there is a clicking sound.

The dashboard lights illuminate, but the engine refuses to start.

After a jumpstart, the engine will not start.

3.5 A Simple Solution To Alternator Or Battery Issues

Allowing a professional to inspect your alternator or battery is the best approach to get your problems resolved. They'll even assist you in locating a new alternator or battery (if that's what you require)!

When everything works well, driving your automobile is frequently a fluid operation that delivers you where you want to go without a second thought. However, if your car does not start regularly, it can be annoying and upsetting. What's the reason? It's most likely a faulty automobile battery or alternator.


3.6 How to Determine If an Alternator or Starter Is Bad

  Bad Starter Bad Alternator
Step 1 Turn on the ignition. If the engine won't start, either your battery is dead or your starter is broken. Keep an ear out for a click. Some starters hum while rotating and then click, while others click immediately after you turn on the ignition. If you hear a click, your starter may be defective. However, there are several more tests you can perform to ensure if it is bad. Start the automobile. If the car difficulties to start, it could be due to a faulty battery or alternator. If the battery is strong enough, you can still drive for a short time with a faulty alternator. If you have a battery gauge on your dashboard, check it. If it is low, it means that your battery is not receiving enough power from the alternator.
Step 2

Remove the hood. Wiggle your battery's connectors. Turn on your headlights to examine if they are brighter than usual or if they have dimmed. If your battery is not low and your car will not start, this is another sign that the problem is with your starter. Try jumping-starting your automobile to see if it helps it start. If this is the case, it indicates that the issue is not with your starter. If a jump makes no difference, you're probably looking at a bad starter.

While the car is running, disconnect the negative battery cable. If the engine shuts down, it's a sign that the alternator isn't working properly. This is due to the alternator supplying a large portion of the car's electrical power while it is running.
Step 3

Lightly tap the starter a couple of times with a hammer. Try restarting the automobile. This can sometimes assist the starter to re-engage, but it will still need to be changed within the following few starts. If touching the starter causes the car to start the next time you crank it, this is another sign that your starter is faulty.

When you replace the starter, take it to the parts store. They will be able to perform the last test to determine whether it is bad or not. If it is not, you will know you need to replace a different item. If the starter appears to be in good working order when tested, consult an expert at an auto parts store or a technician.

Take the car to an auto parts store right away. They will be able to perform an electrical test on the alternator to see if it is faulty or if the battery itself is faulty and must be replaced. The alternator is far more difficult to replace than the battery. The only way to know for sure if the alternator and battery need to be changed is to have a professional test them both.

Ⅳ Bad Alternator and Bad Battery Effects

If an automobile has a defective alternator, it may be able to run for a short period of time depending on how much energy it uses. Once the battery has started the automobile, the alternator's purpose is to recharge it while you're driving. A faulty alternator will not charge the battery properly. Furthermore, if the battery is faulty, an alternator in good operating order will be unable to charge it.

Ⅴ Common Causes of Car Battery Failure

High temperatures The most common cause of battery failure is heat. In the positive plate, heat drives grid corrosion and grid growth. As heat corrodes the positive grid, the battery loses capacity and starting power, making it less capable of starting an engine - especially in colder temperatures.
High vibration Vibration can cause internal components to be damaged and separated, resulting in diminished starting performance or even battery failure.
Deep drains/failure to recharge after drops in voltage When a battery is discharged, the active components inside the plate form lead sulfate crystals, which are referred to as discharged material. These crystals gradually unite to produce larger crystals if they are not recharged. These larger crystals are more difficult to dissolve and recharge, and they eventually cause battery failure by disturbing the plate structure.
A faulty alternator A defective alternator will result in a battery that is either undercharged or entirely drained. Undercharged batteries have lower capacity and starting power. If the battery is constantly undercharged due to a faulty alternator, it will become deeply drained and sulfation will develop.

Other Possible Causes of Car Battery Failure

Battery application and installation

  • The battery is not being utilized for the purpose for which it was intended. For example, using an SLI (Starting-Lighting-Ignition) battery in a vehicle that requires a deep-cycle battery is a typical mistake.
  • The battery is not suitably sized for the purpose.
  • The vehicle has an excessive number of electrical accessories.
  • The battery is not securely fastened.

Service and maintenance

  • The battery wires have not been properly cleaned or adjusted to fit the battery terminals.
  • The electrical system of the car has been repaired or altered.
  • The automobile has been in storage for a long time.

Ⅵ Risk of Driving with a bad alternator or battery

6.1 Risks of Driving with a Bad Alternator

Even if the automobile can drive with a damaged alternator, there are concerns because the battery will have to absorb the majority of the car's power outage. Some of the dangers are as follows:

  • Because the alternator, which should refill the lost power, is faulty, the automobile may lose power and break down.
  • Battery drain: A faulty alternator causes the automobile battery to drain faster than usual, leaving you stranded on the road. A faulty alternator might also reduce or eliminate the battery's ability to hold a charge.
  • Fire hazard: Because of the increased burden on the battery, it may overheat, resulting in the battery catching fire.

6.2 Risks of Driving with a Bad Battery

When your car's battery dies, you can jumpstart it and continue driving because the alternator will sustain the vehicle's power needs while on the road. However, the alternator will generate a lot of heat, and this heat will eventually harm the alternator.

To prevent the expense of purchasing a new alternator, avoid continually jumping and operating your vehicle and instead get a new battery.

Ⅶ 5 Tips for driving longer with a bad alternator

Driving with a bad alternator is not recommended, however, there are ways to extend your driving time if you're a considerable distance from where you can get your alternator repaired. Here are a few pointers to help you drive longer:

  • When you need to start your automobile, keep a jumpstart booster or another car battery nearby.
  • Limit the usage of electrical components like radios, lights, fans, and power windows while driving.
  • Replace incandescent lamps with LEDs to reduce power consumption.
  • Make sure you don't let your battery die fully before charging it again.
  • As often as possible, fully charge the battery with a trickle charger.

Ⅷ How Long Does An Alternator or A Battery Last?

8.1 How Long Does An Alternator Last?

Most alternators are designed to last 150,000 miles. This ranges from 7 to 10 years for the majority of people. As a result, when you have alternator troubles, it is usually caused by something else.

If you frequently travel through tough circumstances such as dirt, sand, rain, and snow, your alternator may fail sooner. These conditions' dirt and grime can cause your alternator to fail immediately. In other circumstances, direct contact or rough driving conditions might cause internal alternator parts to be damaged.

Although alternators are designed to extend the life of your vehicle, this does not mean that you do not have a problem with your vehicle. Before you rule it out, thoroughly inspect your vehicle and keep an eye out for the common indications.

8.2 How Long Do Batteries Last?

Alternators have a substantially longer lifespan than batteries. A battery's lifespan also varies greatly depending on the quality and type of battery purchased. Most new car batteries are supposed to last between 2 and 4 years.

When you replace your battery, the lifespan will be determined by the battery's quality. High-quality batteries can last 5 to 7 years, although low-cost batteries often last 2 to 4 years.

Ⅸ How To Check Your Battery Or Alternator?

When your battery or alternator fails, you may experience similar sensations. Testing your battery and alternator is one of the most important things you can do. Fortunately, a voltmeter or multimeter may be used to test your battery and alternator. This is a simple, quick, and effective method for determining what is causing the problem with your automobile.

9.1 How To Test Your Alternator?

There are a few things you can do to put the starter through its paces. The starter solenoid is the simplest thing to examine. The starter solenoid functions as an electromagnet relay, allowing the starter to engage. The starter solenoid is directly connected to the starter.

A visual inspection of the wires can be used to verify the starter solenoid. You will need to test the voltage if all of the wires are not broken and are properly connected.

A simple multimeter or a circuit tester can be used to test the voltage. If the multimeter or circuit tester does not show any voltage or light up, the problem is most likely with your starter. This signifies that the starter isn't getting the power it needs to start.

If the solenoid passes the test, the problem is most likely with the starter. It is not an easy task to inspect and test the starter. Unless you are a seasoned vehicle hobbyist, I recommend having a professional evaluate your starting.

When you use a multimeter to test your alternator, it should read between 12.6 and 14.2 volts.

Normally, 12.6 volts is regarded approaching low, but your alternator can still function normally at this point.

If you get a lower result, your alternator most likely has a voltage problem.

If you get a reading that is higher than 14 volts, your alternator is most likely faulty.

9.2 How To Test Your Battery?

Battery testers that are both effective and economical can be purchased online. A simple multimeter or voltmeter can also be used.

To test, set your multimeter to 20 volts. Then, with the red probe, connect to the positive battery connection and the black probe to the negative battery terminal. You will get your reading after both probes are on the terminals.

If your battery does not give you a proper reading after both instances, it is a warning that it is dying and you should test it further.

When the automobile is turned off, a good battery should read between 12.2 and 13 volts.

When the automobile is running, the battery voltage should be between 13 and 14.8 volts.

Anything outside of these ranges indicates that your car battery is draining and not being refilled.

It's vital to remember that if your engine's reading exceeds the range for a decent battery, it's a symptom of a bad battery or alternator problems.

 FAQs On the Alternator and Battery

Here are a couple of questions (and their answers) on these charging system components:

1. Can A Vehicle Alternator Charge A Battery Bank?

Yes. You may utilize a variety of setups to charge your house battery bank from the alternator. The simplest technique is to connect the alternator to the starting and house batteries in parallel. Others may use a charge controller and an external voltage regulator.

2. How Long will a Battery Last with a Bad Alternator?

A damaged alternator won't charge the battery, which means the battery will have to power the headlights and the rest of the car's accessories and systems. This could quickly deplete the battery. The battery may run flat in minutes to a few hours, depending on how much charge was left in the battery and how old it is. The engineering on older diesel engines is simpler, and there are fewer things that drain power from the battery. As a result, these automobiles with a damaged alternator's battery may be able to support the vehicle for longer. Many systems in modern gas-powered cars use power from the battery, which can cause the battery to drain faster if the alternator fails.

3. Will a Bad Alternator Kill a New Battery?

Yes, it is possible. So, before you replace the battery, get the alternator tested. A defective alternator, on the other hand, can quickly harm a new battery.

4. How do you tell if it’s your alternator or your dead battery?

Strange growling sounds, a burning odor, or alternating dimming and illumination of your headlights and interior light are all signs of a damaged alternator. The battery is most likely to blame if the automobile struggles to start or requires a jump start every time. It is advisable to seek the help of a qualified mechanic to analyze the problem and decide if it is caused by the battery or the alternator.

5. Will an alternator charge a dead battery?

Alternators aren't meant to recharge a dead battery; they're meant to keep it charged. Charging a dead battery with an alternator will cause the alternator to fail prematurely. When an alternator tries to charge a dead battery, it must operate at full capacity, yet due to the heat it produces, an alternator is only meant to operate at full capacity for brief periods of time. Before starting an alternator, it's always a good idea to charge a dead battery with a battery charger.

6. Can I disconnect a battery with the engine running to test the alternator?

It's not a good idea! You run the risk of frying all of your vehicle's electrical components. The voltage regulator instructs the alternator to produce maximum power as soon as the battery is disconnected. The alternator can produce up to 50 or 60 volts depending on engine RPMs when there is no battery in the circuit to act as a capacitor. When the dust settles, that "simple test" might cost you thousands of dollars in new gadgets. This is an extremely bad practice that will almost certainly harm the alternator or the vehicle.

7. How can I prevent my alternator from failing in the future?

You should include your alternator in your scheduled maintenance period to avoid it falling in the future. By keeping an eye out for any of these signs. You'll be able to tell when your alternator is about to fail. Also, testing your battery and alternator using your code reader, if it has that capability, will save you time.

8. Will A Dead Battery Damage My Alternator?

No, a dead battery will not inevitably cause alternator damage. Recharging the battery is one of the alternator's primary responsibilities. As a result, if you have a dead battery, you can fully charge it by driving for 30 minutes to two hours. If your battery does not hold a charge, it can cause your alternator to wear out prematurely.

9. Is it possible to jumpstart a car with a bad alternator?

Yes, but it is dangerous. The issue with jumping a car with a damaged alternator is that the automobile's electrical system is powered by alternating current. If your alternator isn't working properly, your battery may not be sufficiently charged when you start your engine, which might have disastrous effects.

10. How Much Does A New Car Battery Cost?

A new automobile battery ranges in price from $50 to $250, depending on the manufacturer and whether it is a premium battery or not. Some high-end vehicles require special batteries that can only be obtained through the dealer and can cost up to ten times the price of a standard battery. So, to avoid entirely depleting your bank account, treat such vehicles with extreme caution.

11. How Much Does A New Alternator Cost?

A replacement alternator typically costs between $300 and $2,000, though this can vary substantially depending on a variety of factors. Labor prices vary widely depending on how accessible the alternator is and how much effort is required to replace one. In any case, it's always a good idea to utilize original parts when it comes to important car components, as it's never a good idea to scrimp on these.

12. How much does it cost to replace alternator?

When your automobile begins to have electrical troubles, it's a sign that your alternator needs to be replaced. When you factor in the cost of a new alternator as well as labor, you should budget between $500 and $1,000 to replace your vehicle's alternator.

13. Is It Worth Tt Fixing A Broken Alternator?

An alternator is expensive, but it is always best to replace it if it begins to cause serious problems. If you opt to repair it, be in mind that the repair may not stay long. This procedure is also known as "remanning" the alternator, and it consists of removing worn-out and damaged alternator components and replacing them with newer ones.

14. How Do I Know Which Battery To Buy For My Car?

It's usually a good idea to consult the owner's handbook, but you may also seek information on your previous battery if you still have it, or contact the dealer. Another option is to look for it online, as most car-enthusiast forums offer a wealth of information about which battery is ideal for your vehicle and where you can obtain it at the greatest price.

15. Do I need a new battery after replacing alternator?

This implies that in most circumstances, no additional labor is required, and you will only need to pay for a new drive belt, which is not particularly expensive. Is it necessary to replace the battery whenever the alternator is replaced? It is not required, but it is fairly uncommon for an old battery to fail when an alternator fails.

16. Is it safe to drive with a bad alternator?

If you jump-start appropriately, there should be no damage to the donor or recipient's automobile, and it is typically safe to do so, but driving a car with a damaged alternator offers a risk, especially if you have a newer car. Everything in your automobile, including the lights, AC, radio, and so on, is powered by the alternator.

17. Why is my new alternator not charging my new battery?

The most obvious reason your battery won't charge even though your alternator is brand new is that the fault is with the battery itself. If you're not sure, you can check the current flowing from your battery with a multimeter or a voltmeter.

18. How long will a car run without alternator?

For those unhappy people who discover that this crucial component of the vehicle is malfunctioning, how long will a car run without an alternator and what can you do to extend the vehicle's ability to function? Without this vital component, your car will only run for up to two hours and as little as five minutes.

19. How far can I drive with a dead alternator?

You should be fine as long as you don't have any accessories running. Check that your battery is completely charged. My box truck's alternator has failed. I made it 25 miles (about an hour of

driving time) with a half-charged battery, running the headlights and starting it about 5 times before the battery died.

20. Do alternators fail suddenly?

The alternator is a critical component in the operation of your vehicle's electrical systems. When your alternator begins to fail, it can create a range of electrical difficulties in your vehicle, eventually leading to a breakdown. Alternators can fail suddenly or gradually over time.

Final Thoughts

A faulty alternator is an unwelcome news. This is a challenging condition to diagnose if you are not a mechanic. However, if you've had your battery checked and are quite certain it's not a battery problem, take your car to a mechanic to be properly examined.

If your automobile won't start normally, you most likely have a problem with your battery or alternator.  The indicators above can help you determine if a bad alternator vs a bad battery. However, if you're still unclear about recognizing the symptoms of a broken alternator or a dead battery, it doesn't hurt to get your vehicle inspected by an expert who can assist you. While having automotive problems is inconvenient, you want to be safe on the road. To do so, make sure you have adequate auto insurance coverage.

To be cautious, have your car inspected if you suspect a problem. It may cost you a little money upfront, but it will save you money in the long term. So, if you have alternator or battery problems, get them addressed as soon as possible to avoid more problems.


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