How to Find ACC Wire in Car

How to Find ACC Wire in Car: A Step-by-Step Guide

If you are planning to install a new car accessory or gadget that requires power even when the vehicle is turned off, then you need to find the ACC wire in your car. The ACC wire, short for accessory wire, is a wire that carries power only when the ignition is turned on. By tapping into the ACC wire, you can ensure that your new device is only powered when the car is in use. In this article, we will guide you through the process of finding the ACC wire in your car.

Step 1: Gather the necessary tools
Before you begin, make sure to have the following tools handy: a multimeter, wire strippers, electrical tape, and a circuit tester.

Step 2: Locate the fuse box
The fuse box is often located under the dashboard on the driver’s side. Look for a removable panel that gives you access to the fuses.

Step 3: Identify the ACC fuse
Using the circuit tester, probe the fuses one by one until you find one that only has power when the ignition is turned on. This will be the ACC fuse.

Step 4: Remove the ACC fuse
Once you have identified the ACC fuse, carefully remove it using a fuse puller or a pair of pliers.

Step 5: Connect the multimeter
Set your multimeter to measure voltage and connect the black probe to a ground point in your car. This could be a metal bolt or any other unpainted metal surface.

Step 6: Test the fuse socket
Insert the red probe of your multimeter into the ACC fuse socket and turn the ignition on. If your multimeter shows a voltage reading, then you have found the ACC wire.

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Step 7: Strip the ACC wire
Using wire strippers, carefully strip a small section of the ACC wire to expose the bare copper.

Step 8: Connect your accessory
Now that you have found the ACC wire, you can connect the positive wire of your accessory to it. Make sure to use electrical tape or wire connectors to secure the connection.

Common Questions and Answers:

1. Why is it important to find the ACC wire?
Finding the ACC wire ensures that your new accessory is only powered when the ignition is turned on, preventing battery drain.

2. Can I use any wire in my car as the ACC wire?
No, not all wires in your car carry power only when the ignition is turned on. It is crucial to find the ACC wire to ensure proper functionality.

3. Can I tap into the ACC wire for multiple accessories?
Yes, you can connect multiple accessories to the ACC wire by using a wiring harness or a fuse tap.

4. Can I use the cigarette lighter socket as the ACC wire?
Yes, the cigarette lighter socket is often connected to the ACC wire. However, tapping into the wire directly is a more reliable option.

5. Can I use the ACC wire to power high-power devices?
The ACC wire is typically designed to power low-power accessories. For high-power devices, it is recommended to connect them directly to the battery or use a relay.

6. Can I damage my car’s electrical system while finding the ACC wire?
When done carefully, finding the ACC wire should not cause any damage. However, it is always recommended to consult a professional if you are unsure.

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7. Is it necessary to disconnect the battery before finding the ACC wire?
While it is not necessary, disconnecting the battery can provide an extra layer of safety during the process.

8. Can I find the ACC wire in any car model?
Yes, the ACC wire is present in almost all car models. However, its location within the fuse box may vary.

9. Can I use a test light instead of a multimeter?
Yes, a test light can also be used to find the ACC wire. Follow the same steps, but instead of a multimeter, use the test light to check for power.

10. Can I use a fuse tap instead of removing the ACC fuse?
Yes, a fuse tap is a convenient way to tap into the ACC wire without removing the fuse. Follow the manufacturer’s instructions for proper installation.

11. Can I use the ACC wire to power a dashcam?
Yes, the ACC wire is commonly used to power dashcams, ensuring they only record when the car is in use.

12. Can I find the ACC wire without a multimeter or circuit tester?
While it is possible to find the ACC wire without these tools, they greatly simplify the process and provide accurate readings.

Remember, if you are not confident in your abilities to find the ACC wire, it is always best to consult a professional car electrician who can safely install your desired accessory.

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