1. Check the Fuses: Start with the simplest solution. Check the fuses related to the headlight motors in your fuse box (consult your owner's manual for the correct fuse locations). Replace any blown fuses.
2. Inspect the Headlight Motors:
* Access: You'll need to access the headlight motors. This usually involves removing parts of the headlight assemblies or accessing them from the engine compartment. Consult a repair manual specific to your 1989 Corvette for detailed instructions on accessing the motors.
* Visual Inspection: Look for any obvious signs of damage, such as broken wires, stripped gears, or binding. Listen for unusual noises (grinding, clicking) when you try to raise the headlights. A seized motor will make a grinding noise, while a motor with bad gears may click.
* Manual Test (Careful!): If you can safely access the motor shafts, try gently turning them by hand to see if they move freely. Resistance or binding indicates a problem.
3. Check the Headlight Motor Relay: The headlight motors are usually controlled by a relay. A faulty relay can prevent the motors from receiving power. Locate the relay (your owner's manual or a repair manual will be invaluable here) and try swapping it with a known good relay of the same type. (Never swap relays without understanding the amperage and voltage requirements. Improper swapping can blow fuses or damage components.)
4. Examine the Wiring:
* Connections: Inspect all wiring connections related to the headlight motors for corrosion, loose connections, or broken wires. Clean or repair as needed. Pay particular attention to the connections at the motors themselves.
* Wiring Harness: Look for any signs of damage to the wiring harness that runs to the headlight motors. Cracks, abrasions, or chafing against other parts can cause intermittent or complete failure.
5. Check the Switch: The headlight switch itself could be faulty. If other headlight functions (low beams, high beams) work correctly, the switch is less likely the culprit, but it's still worth considering.
6. Power and Ground: Ensure the headlight motors are receiving adequate power and have a good ground connection. Use a multimeter to test for power at the motors when the headlights are activated.
Important Notes:
* Repair Manual: A 1989 Corvette repair manual is highly recommended. It will provide detailed diagrams, specifications, and troubleshooting steps.
* Safety: Disconnect the battery negative terminal before working on any electrical components.
* Professional Help: If you're not comfortable working on electrical systems, it's best to take your Corvette to a qualified mechanic. Improper repairs can lead to further damage or even electrical fires.
By systematically checking these points, you should be able to narrow down the cause of your headlight problem. Remember safety first!
