Coil wiring diagrams can be confusing, especially for vintage vehicles like the 1966 GM. Finding the right wiring diagram is important in order to properly diagnose and fix any electrical issues. This article will provide a detailed breakdown of the 1966 GM coil wiring diagram, along with frequently asked questions and tables for easy reference.
Understanding the Basics
Before diving into the specifics of the wiring diagram, it’s important to understand the basics of how a coil works. A coil is an electrical component that converts low voltage into high voltage. In the case of a car, the coil converts the 12-volt battery voltage into the voltage needed to power the spark plugs. Without a functioning coil, a car’s engine won’t start.
A typical coil has two primary connections – positive and negative. The positive connection is usually connected to the ignition switch, while the negative connection is connected to the distributor. Whenever the ignition switch is turned on, the coil receives power and begins to build up a charge. When the distributor sends a signal to the coil, the charge is released, creating a spark at the spark plugs.
The Wiring Diagram
The 1966 GM coil wiring diagram can be broken down into three main components – the coil, distributor, and ignition switch. Each of these components is connected by a series of wires, which can be confusing to decipher. The table below provides a breakdown of the main wires and their connections:
| Wire Color | Component | Connection |
|---|---|---|
| Red | Ignition Switch | Hot |
| Brown | Coil | Positive |
| Green | Distributor | Negative |
| Grey | Coil | To Tachometer |
These connections will vary depending on the type of engine that the 1966 GM is equipped with. It’s important to refer to the specific wiring diagram for your engine to ensure accurate connections.
Frequently Asked Questions
What is the purpose of the coil?
The coil is an electrical component that converts low voltage into high voltage. In the case of a car, the coil converts the 12-volt battery voltage into the voltage needed to power the spark plugs. Without a functioning coil, a car’s engine won’t start.
What are the common symptoms of a bad coil?
The most common symptoms of a bad coil include engine misfires, difficulty starting the vehicle, and a decrease in engine power. If you suspect a bad coil, it’s important to have it replaced as soon as possible to prevent further damage to your car’s engine.
How can I tell if my coil is bad?
There are several ways to test a coil to determine if it’s functioning properly. One method is to use a multimeter to test the resistance of the coil. A properly functioning coil will have a resistance between 6,000 and 15,000 ohms. Another method is to use a spark tester to check for a spark at the spark plugs. If there is no spark, the coil may be bad.
Can I replace the coil myself?
Replacing a coil can be a difficult task, especially for those with limited automotive experience. If you’re unsure about how to replace a coil, it’s best to consult with a professional mechanic. Attempting to replace the coil yourself could result in further damage to your car’s engine.
What other parts should I replace when replacing the coil?
When replacing the coil, it’s recommended to also replace the spark plugs, distributor cap, and ignition rotor. These parts work together to ensure proper ignition and should be replaced at the same time as the coil.
Conclusion
The 1966 GM coil wiring diagram can be confusing, but with a little bit of knowledge and the right tools, it’s possible to diagnose and fix any electrical issues. Remember to refer to the specific wiring diagram for your engine to ensure accurate connections. If you’re unsure about how to replace a coil, it’s best to consult with a professional mechanic.
