1978 Chevy 350 Starter Wiring Diagram

If you own a 1978 Chevy 350, you may be having difficulties with its starter wiring. The Chevy 350 is a popular engine, and it’s always helpful to have information on how to work on it. This article will provide you with a comprehensive guide on how to wire the starter of your 1978 Chevy 350.

What is a Starter Motor?

The starter motor is an essential part of any gasoline-powered engine. It is responsible for turning the engine over when you try to start it. In essence, it is the device that gives that initial push to the engine, which then takes over and keeps running on its own. The starter motor is connected to the battery, and it draws power from it to spin the engine.

A starter motor typically has a solid metal casing, with a couple of electrical connections that attach it to the battery, the solenoid, and the engine. It also has a gear that meshes with the engine’s flywheel or flexplate, and it turns it over.

The Chevy 350 Starter Wiring Diagram

The starter wiring diagram for the Chevy 350 is a simple and straightforward one. The starter requires power from the battery to function, and it also requires a signal from the ignition switch. Here’s how to wire the starter of your 1978 Chevy 350.

The Battery Connection

The battery connection is straightforward. One end of the battery cable connects to the positive terminal of the battery. The other end connects to the starter’s positive terminal. Make sure this cable is thick enough to handle the current that flows through it, and that it’s routed properly, so it doesn’t get damaged by the engine’s moving parts.

The Ignition Switch Connection

The ignition switch connection is a bit more complicated. It requires two wires – one for power and one for the signal. The signal wire is usually a smaller one, and it connects to the S terminal on the starter solenoid. The power wire is usually a thicker one, and it connects to the large terminal on the solenoid.

When you turn the key in the ignition switch, it sends power to the starter solenoid. The solenoid then sends power to the starter motor, which turns the engine over. Once the engine starts, the solenoid disengages, and the starter motor stops spinning.


Q. Why is my 1978 Chevy 350 starter not working?

A. There are several reasons why a starter might not work. It could be due to a dead battery, a faulty starter motor, a broken connection, or a worn-out solenoid. Check each of these components and rule out any issues before moving on to other potential problems.

Q. How can I troubleshoot the starter system on my 1978 Chevy 350?

A. Start by checking the battery voltage. If it’s low, charge it or replace it. Next, check the battery connections and the cables. They should be clean and free of corrosion. Finally, check the solenoid and the starter motor. If they’re not working correctly, replace them. If all of these components are fine, then you may need to check the ignition switch or the wiring.

Q. Can I use a universal starter motor on my 1978 Chevy 350?

A. Yes, you can use a universal starter motor on your 1978 Chevy 350. However, it’s imperative to check the fit and compatibility before making any purchases. You should always use a starter motor that’s specifically designed for your Chevy 350 to ensure proper operation.


Wiring the starter of your 1978 Chevy 350 can seem like a daunting task, but it’s a necessary one. Knowing how to wire this critical component is essential to the proper operation of your engine. With the information provided in this article, you should be able to wire your starter correctly and troubleshoot any issues that may arise.