Steering columns are an integral part of any vehicle, and they require appropriate wiring to function correctly. The 1970 GM steering column wiring diagram is a crucial guide for individuals looking to repair or replace their steering column wiring system. This article will provide detailed information about the 1970 GM steering column wiring diagram, including its components, wiring, and troubleshooting tips.
Components of 1970 GM Steering Column Wiring Diagram
The 1970 GM steering column wiring diagram consists of the following components:
- Ignition switch
- Turn signal switch
- Horn relay
- Neutral safety switch
- Column-mounted dimmer switch
- Wiring harness
Ignition Switch
The ignition switch is an essential component of the steering column wiring system. It is responsible for providing power to the vehicle’s electrical system, including the starter motor and ignition coil. The ignition switch is generally located on the steering column or dashboard and has several positions: off, accessory, run, and start.
In the off position, the ignition switch turns off all electrical power to the vehicle. In the accessory position, the switch provides power to the radio and other accessories. In the run position, the switch provides power to the entire electrical system, except for the starter motor. Finally, in the start position, the switch provides power to the starter motor to start the engine.
Turn Signal Switch
The turn signal switch is responsible for controlling the turn signals and hazard lights in the vehicle. It is usually located on the steering column or dashboard and has several positions: left turn, right turn, and off.
In the left turn position, the switch provides power to the left turn signal. In the right turn position, the switch provides power to the right turn signal. Finally, in the off position, the switch turns off all turn signals and hazard lights.
Horn Relay
The horn relay is responsible for controlling the vehicle’s horn. It is usually located in the engine compartment and receives power from the steering column wiring harness. When the driver presses the horn button on the steering wheel, the horn relay sends power to the horn to produce a sound.
Neutral Safety Switch
The neutral safety switch is responsible for preventing the engine from starting when the vehicle is in gear. It is usually located on the steering column or transmission and receives power from the ignition switch. When the switch detects that the vehicle is in gear, it prevents power from reaching the starter motor.
Column-Mounted Dimmer Switch
The column-mounted dimmer switch is responsible for controlling the brightness of the vehicle’s interior lights. It is usually located on the steering column and has several positions: off, dim, and bright. In the off position, the switch turns off all interior lights. In the dim position, the switch reduces the brightness of the interior lights. Finally, in the bright position, the switch provides full power to the interior lights.
Wiring Harness
The wiring harness is responsible for connecting all of the steering column components and providing power to them. It consists of several wires, each with a specific color and function. The wiring harness is usually located inside the steering column and can be accessed by removing the steering wheel and upper column cover.
Wiring of 1970 GM Steering Column Wiring Diagram
The 1970 GM steering column wiring diagram consists of several wires, each with a specific color and function. The wiring of the diagram can be quite complex, and it is essential to follow the diagram carefully to avoid damaging the steering column or electrical system.
Here is a breakdown of the wiring colors and their functions:
| Wire Color | Function |
|---|---|
| Orange | Battery power (constant) |
| Pink | Ignition power (switched) |
| Purple | Starter solenoid activation |
| Yellow | Accessory power (switched) |
| Green | Left turn signal |
| Dark Green | Right turn signal |
| Light Blue | High beam headlights |
| Brown | Tail and marker lights |
| Gray | Horn |
| Black | Ground |
Troubleshooting Tips for 1970 GM Steering Column Wiring Diagram
Steering column wiring problems can be challenging to diagnose and repair. Here are some troubleshooting tips for the 1970 GM steering column wiring diagram:
No Power to the Ignition System
If there is no power to the ignition system when the key is turned, the problem could be a faulty ignition switch, wiring, or a blown fuse. Check the wiring harness for any loose connections or damaged wires. If the wiring harness is damaged, replace it.
Turn Signals Not Working
If the turn signals are not working, the problem could be a faulty turn signal switch, wiring, or a blown fuse. Check the turn signal switch for any signs of damage or wear. If the switch is faulty, replace it.
Horn Not Working
If the horn is not working, the problem could be a faulty horn relay, wiring, or a blown fuse. Check the horn relay for any signs of damage or wear. If the relay is faulty, replace it.
Interior Lights Not Working
If the interior lights are not working, the problem could be a faulty column-mounted dimmer switch, wiring, or a blown fuse. Check the dimmer switch for any signs of damage or wear. If the switch is faulty, replace it.
Conclusion
The 1970 GM steering column wiring diagram is a vital guide for any individual looking to repair or replace their steering column wiring system. It consists of several components, including the ignition switch, turn signal switch, horn relay, neutral safety switch, column-mounted dimmer switch, and wiring harness. Following the wiring diagram carefully is essential to avoid damaging the steering column or electrical system. Troubleshooting common problems requires careful inspection of the wiring and components to isolate the root cause of the issue.
