# 1990 Chevy Truck Ignition Switch Wiring DiagramThe ignition switch is a critical component of your Chevy truck. It's responsible for sending power to the starter motor, which starts the engine. If the ignition switch is faulty, your truck won't start. This article will provide you with a detailed wiring diagram for the 1990 Chevy truck ignition switch. This diagram will help you troubleshoot any problems with the ignition switch, and it will also help you replace the switch if necessary.
1990 Chevy Truck Ignition Switch Wiring Diagram
Wiring Diagram Key*
B- Battery *
IG- Ignition switch *
S- Starter motor *
ST- Starter solenoid *
TA- Terminal A *
TB- Terminal B *
TC- Terminal C
Ignition Switch OperationWhen you turn the ignition key to the "On" position, the ignition switch sends power to the starter solenoid. The starter solenoid then engages the starter motor, which starts the engine. When you turn the ignition key to the "Start" position, the ignition switch sends power to the starter motor directly. This bypasses the starter solenoid and allows the starter motor to engage more quickly.
Troubleshooting Ignition Switch ProblemsIf your Chevy truck won't start, it could be a problem with the ignition switch. Here are a few things you can check to troubleshoot the problem: *
Check the battery voltage.If the battery is low, it won't have enough power to start the engine. *
Check the starter motor.If the starter motor is faulty, it won't be able to engage the engine. *
Check the ignition switch wiring.The ignition switch wiring could be damaged or corroded, which would prevent the switch from sending power to the starter motor. *
Replace the ignition switch.If all of the other components are working properly, the ignition switch itself may be faulty.
Replacing the Ignition SwitchReplacing the ignition switch is a relatively simple task. However, it's important to follow the steps in the correct order to avoid damaging the other components in the system. Here are the steps involved in replacing the ignition switch: 1.
Disconnect the battery.This will prevent any electrical shocks. 2.
Remove the ignition switch cover.This will expose the ignition switch. 3.
Remove the ignition switch screws.These screws are usually located on the back of the ignition switch. 4.
Remove the ignition switch.Carefully remove the ignition switch from the housing. 5.
Install the new ignition switch.Make sure that the new ignition switch is properly aligned with the housing. 6.
Secure the ignition switch with the screws.7.
Reconnect the battery.After you've replaced the ignition switch, test the truck to make sure that it starts properly. ### Conclusion The ignition switch is a critical component of your Chevy truck. If the ignition switch is faulty, your truck won't start. This article has provided you with a detailed wiring diagram for the 1990 Chevy truck ignition switch. This diagram will help you troubleshoot any problems with the ignition switch, and it will also help you replace the switch if necessary.
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