Rewiring your car's electrical system may sound daunting, but it can actually be done quite easily and inexpensively if you follow some simple steps. In this guide, I will walk you through everything I've learned from successfully rewiring my own car's electrical system for under $50.

Reasons To Rewire Your Car's Electrical System

There are a few key reasons why you may want to rewire your car's electrical system:

Upgrading Your Stereo

If you want to upgrade your factory car stereo to an aftermarket one with more wattage, you'll likely need to rewire the stereo system to handle the extra power. The factory wiring is usually too thin to handle aftermarket stereo amps.

Faulty Wiring

Over time, the electrical wires in your car can become damaged or corroded. Rewiring allows you to replace old brittle wiring with brand new wires.

Added Electronic Accessories

If you've added a lot of electrical accessories like lights, inverters, or cameras to your car, a rewire ensures your electrical systems can handle the extra load.

Choosing the Right Gauge Wire

The wire gauge (thickness) you choose depends on the amount of power in your car's electrical system.

Safety Tips

Rewiring your car's electrical system involves dealing with live wires, so safety is paramount:

Step-By-Step Guide

Follow these steps to rewire your car's electrical system:

1. Plan The Wiring Layout

2. Gather The Needed Supplies

For a full rewire, you'll need:

3. Remove The Interior Panels

4. Run New Wires

5. Connect Wires To Components

6. Install Protection Devices

7. Test The System

8. Complete The Install

And that's it! With the right planning and safety precautions, you can rewire your car's electrical system in a weekend for less than $50. Taking the time to do a full rewire will provide you with clean reliable power for all your car's electronics.

Common Questions

How do I know what gauge wire to use?

Choose wire that is rated for at least 20% more amperage than your system requires as a safety margin. For most cars, 16 or 14 gauge is sufficient.

Where do I connect the new wires to?

Connect your new wires directly to the battery, alternator, and grounding points. Install relays, fuses, and distribution blocks to split power to the various circuits.

What are the signs my wiring needs to be replaced?

Dimming headlights, electrical shorts, failed fuses, and flickering dash lights can indicate old brittle wiring that needs replacement.

Can I leave my factory wiring in place and just run new wires?

It's generally better to do a full rewire, but you can run additional wires if needed by routing them away from factory wires.

Rewiring your car's electrical system might seem intimidating, but as you can see it can be done with a little preparation. Not only will you save money by doing it yourself, but you'll also end up with a clean electrical system that meets all your car's needs.