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How “Add a Fuse” Works and FAQ

Author: Apogeeweb
Date: 11 Apr 2022



Ⅰ What is Add a Fuse?

Ⅱ Using “Add a Fuse” Kits

Ⅲ Which “Add a Fuse” is Right For you and your Vehicle?

Ⅳ How “Add a Fuse” Works 



Add a fuse” devices are intended to safely power your dashcam. Add-a-fuse is the safest way to safeguard your car from overcurrent and is compatible with all hardwire systems. You can utilize add-a-fuses with your hardwire kit as long as it has an ACC+ (Red) and a BATT+ (Yellow) wire. Let's learn more about "add a fuse".

 Hardwire with an Add-a-Fuse Kit & Fuse Taps | BlackboxMyCar

Ⅰ What is Add a Fuse?

For hardwiring a dash cam into the vehicle's fusebox, an "add a fuse" kit (also known as fuse tape or add-a-circuit) is a popular choice. Wrapping the wires around the legs of a fuse gives it a more professional appearance and makes it more secure in the long run.

Ⅱ Using “Add a Fuse” Kits

For hardwiring a dashcam into the vehicle's fusebox, an "add a fuse" kit (also known as fuse tap or add-a-circuit) is a popular choice. Wrapping the wires around the legs of a fuse produces a more professional-looking installation and is more secure in the long term.

The purpose of this page is to teach people how to install their add-a-fuse kit. It's a follow-up to our basic hardwiring installation guide.

Ⅲ Which “Add a Fuse” is Right For you and your Vehicle?

micro2-fuse mini-fuse
Micro2 Fuse Mini Fuse
ato-(regular)-fuse low-profile-fuse
ATO (Regular) Fuse Low-Profile Fuse

When buying your "add a fuse" kit, make sure the fuse tap you choose is compatible with the size and voltage requirements for the additional equipment you're about to install as well as the fuse box in your automobile. We provide four different types of add-a-fuse: Micro2 Fuse, Mini Fuse, ATO Fuse, and Low-Profile Mini Fuse.

You can examine your vehicle owner's manual, Google the answer, or contact the dealership where you previously purchased the vehicle to find out which fuse is correct for you. If you still can't locate the answer, our product experts can assist you! 

Ⅳ How “Add a Fuse” Works 

Step 1: In the Add-a-Fuse Kit, place the fuse tap.

Our "add a fuse" kit will always include a fuse tap that should be positioned in the "Fuse 1" position, with the fuse from your fusebox positioned in the "Fuse 2" position (only if you are using a slot with an existing fuse). The hardwire kit will not work if you connect them in the wrong sequence.

The amperage rating of the fuse you choose does not have to be the same as the amperage rating of the fuse we provide.



Step 2: Crimp the Add-a-Fuse Kit to Connect the Hardwiring Kit Cables Together

Trim some of the rubber tubings (if necessary) to expose some wiring on your hardwiring cable with your needle nose pliers (or a similar crimping tool). To finish the connection, attach the other end of the cable to the other end of the add-a-fuse (metal tube) and crimp them together. Once the crimping is complete, tug on the add-a-fuse and wire with some force to ensure that nothing is loose. If everything feels snug, the crimp is secure and the connection is secure.

Step 3: Put the Add-a-Fuse Back into the Fuse Slot

If you're using a typical hardwiring kit, you'll need two add-a-fuses for your hardwire installation (one for a constant fuse and another for the ignition-switched fuse).


When everything is finished, just reinstall the "add a fuse" in the slot where the fuse was removed. Please note that your hardwiring kit's ground wire does not require an "add a fuse" kit and just connects to a metal ground bolt.

Please don't hesitate to contact our product experts if you have any additional queries. We're here to assist you.


1. Can you add a fuse?

The idea is that you remove an existing fuse, put that removed fuse plus a suitable fuse for the new circuit into the device, and then plug the device into the slot from which the fuse was removed...and power your new circuit with the pigtail wire on the device.

2. How do you wire up a fuse?

With a pair of wire strippers, remove 1/2 inch of insulation from the wire that will be connected to the fuse tap, and slip the proper wire connector onto the wire. Using a crimp tool, secure the connector. Insert the fuse tap into the fuse slot of the fuse box, metal-bladed side first, with the wire connected.

3. How do I choose a fuse?

To choose the appropriate fuse amperage, you must first determine the circuit's full-load steady-state current at a temperature of 25° C (68° F). Once the current value has been determined, a fuse rating of 135 percent of the current value should be chosen (taken to the next standard value).

4. Does a fuse go on the positive or negative wire?

The equipment is only protected if the fuse is placed on the negative wire; however, the equipment and the voltage source are both protected if the fuse is placed on the positive wire.

5. What are the different fuse sizes?

Small minis (ATM), mid-sized normal (ATC/ATO), and huge maxis are the three most prevalent blade fuse sizes (APX). The APS, a low-profile variant of the mini, has the same universal Amp color-coding system as the mini. The ATC fuse in ordinary size is more prevalent than the ATO fuse.

6. How much does a fuse cost?

The cost of replacing a fuse is determined by the type of fuse used in the make and model, as well as the amount of power required. The majority of fuses cost between $10 and $20 to repair, but some specialty fuses can cost over $100 to replace, not counting diagnostic expenses.

7. Can a fuse be put in backwards?

If a car battery is connected backward, a fuse designed to protect vehicle electronics should detonate. If your vehicle doesn't have a fuse designed for this reason (nearly all cars have), you'll send electrical current backward through your car's systems, including the ECU, transmission control unit, and others.

8. Should I disconnect battery before changing fuse?

No, you do not need to remove the batteries to check the fuses. Simply remove the fuse and inspect it; most of the time, it will be blown.

9. Which side of fuse is hot?

"The hot side" is defined as "the side that can power the accessory while the fuse is removed." The hot side has 14 volts, whereas the other side has roughly 10 volts for reasons I won't even attempt to guess.

10. What is the load side of a fuse?

Power leaves the device (or electrical box) and travels down the circuit on the load side.



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