If you’re a car enthusiast, you probably know how important it is to have a well-functioning distributor. The distributor is responsible for sending high-voltage power to the spark plugs in your engine. With the right wiring diagram, you can ensure that your GM HEI distributor is working at peak performance. In this article, we’ll take a closer look at the wiring diagram for GM HEI distributor and answer some frequently asked questions.
What is a GM HEI Distributor?
A GM HEI distributor stands for High Energy Ignition. It was first introduced in the 1970s and became a popular choice for car enthusiasts due to its superior performance. The GM HEI distributor is a compact, all-in-one ignition system that delivers high voltage to the spark plugs, resulting in better combustion and improved engine performance. The distributor has a built-in ignition coil, eliminating the need for a separate coil, and the distributor cap includes routing for the spark plug wires.
The Components of GM HEI Distributor
The GM HEI distributor consists of several components, including:
| Component | Description |
|---|---|
| Distributor Cap | Routes high voltage to the spark plugs. |
| Ignition Coil | Generates high voltage for the distributor. |
| Module | Controls the timing of the spark. |
| Pickup Coil | Detects the position of the distributor shaft. |
Wiring Diagram for GM HEI Distributor
Here is a wiring diagram for a GM HEI distributor:
Wire Color | Function
Red | Battery positive
Yellow | Ignition switch
Orange | Ignition coil positive
Black | Ground
White | Tachometer signal
The wiring diagram is relatively simple, with only a few wires to connect. The red wire should be connected to the positive terminal of your car’s battery. The yellow wire should be connected to the ignition switch, which is typically located on the steering column. The orange wire should be connected to the positive terminal of the ignition coil, while the black wire should be connected to a good ground on your car’s chassis. Finally, the white wire should be connected to your tachometer, if you have one installed.
What Kind of Spark Plug Wires Should I Use?
When installing a GM HEI distributor, it’s important to use high-quality spark plug wires that can handle the high voltage output of the system. You should look for wires with a low resistance, typically between 40 and 50 ohms per foot. You can also use solid core wires or suppression core wires, depending on your preference.
How Can I Test My GM HEI Distributor?
There are a few things you can do to test your GM HEI distributor if you suspect it’s not working properly. First, you can check the voltage at the distributor coil using a multimeter. You should see a voltage output between 10 and 12 volts. You can also check the resistance of the distributor’s pickup coil using a multimeter. The resistance should be between 500 and 1,500 ohms, depending on the make and model of your distributor.
Another way to test your GM HEI distributor is to perform a spark test. Remove one of the spark plug wires from the distributor cap and hold it near a ground on your car’s engine. Have someone crank the engine while you watch for a spark. If you see a spark, your distributor is likely working properly. If you don’t see a spark, you may have a problem with the distributor or another component in the ignition system.
Conclusion
With the right wiring diagram and some basic knowledge, you can install and maintain a GM HEI distributor in your car. By using high-quality spark plug wires and performing regular maintenance, you can ensure that your distributor is working at peak performance and delivering the best possible ignition to your engine.
