1985 Chevy C10 Alternator Wiring Diagram

If you’re looking for a wiring diagram for a 1985 Chevy C10 alternator, you’re in the right place. Whether you’re restoring a classic Chevy truck, or just troubleshooting an electrical issue, having a reliable wiring diagram is essential. In this article, we’ll provide you with a detailed wiring diagram, as well as some frequently asked questions about Chevy C10 alternators.

Wiring Diagram

Before we get started with the wiring diagram, it’s important to understand how the alternator works. The alternator is responsible for charging the battery and providing power to the electrical system of the vehicle. It does this by converting mechanical energy from the engine into electrical energy.

The wiring diagram for the 1985 Chevy C10 alternator is relatively simple, as there are only a few wires involved. Here’s a breakdown of the wiring:

Wire Color Function
Red Battery Positive
White Stator
Yellow Field
Black Ground

Now, let’s take a closer look at each of these wires:

Red Wire

The red wire is the battery positive wire, which provides power to the alternator. This wire should be connected to the positive terminal on the battery.

White Wire

The white wire is the stator wire, which provides a signal to the regulator to control the charging rate. This wire should be connected to the stator terminal on the alternator.

Yellow Wire

The yellow wire is the field wire, which provides power to the alternator’s field windings. This wire should be connected to the field terminal on the alternator.

Black Wire

The black wire is the ground wire, which provides a path for electrical current to return to the battery. This wire should be connected to a clean, unpainted metal surface on the vehicle’s frame.

Here’s a diagram of how the wiring should be connected:

1985 Chevy C10 Alternator Wiring DiagramSource: bing.com

Frequently Asked Questions

How do I know if my alternator is bad?

If your alternator is bad, you may experience a variety of symptoms, including dimming headlights, a dead battery, a whining noise coming from the alternator, or dashboard warning lights. You can test your alternator with a voltmeter to determine if it’s charging correctly.

What size alternator do I need for my Chevy C10?

The size of alternator you need will depend on the electrical demands of your vehicle. As a general rule, a 70-amp alternator should be sufficient for most Chevy C10s. However, if you have a lot of aftermarket electrical accessories, you may need a higher output alternator.

Can I install a high-output alternator on my Chevy C10?

Yes, you can install a high-output alternator on your Chevy C10 if you need more electrical power. However, keep in mind that a higher output alternator may require modifications to the wiring or brackets, and may also create more load on the engine.

How long does an alternator last?

An alternator can last anywhere from 50,000 to 100,000 miles, or more. However, the lifespan of an alternator can be affected by a variety of factors, including driving conditions, electrical demands, and maintenance. It’s a good idea to have your alternator tested periodically to ensure it’s functioning properly.

Can I replace my alternator myself?

Replacing an alternator can be a relatively simple job, but it does require some mechanical knowledge and tools. If you have experience working on cars and feel comfortable with basic electrical systems, you can likely replace your alternator yourself. However, if you’re not confident in your abilities, it’s best to take your vehicle to a qualified mechanic.


We hope this article has provided you with a helpful wiring diagram and some useful information about Chevy C10 alternators. Remember, it’s important to have a reliable wiring diagram when working on electrical systems, and to properly maintain your alternator to ensure it lasts as long as possible.