* Bulb: The most common cause. Check the courtesy light bulb itself. It might be burnt out. This is the easiest and cheapest fix.
* Switch: The courtesy light switch might be faulty. This switch is often located on the driver's side door jamb and is activated when the door opens. It could be broken, loose, or have a poor connection. Test continuity through the switch with a multimeter when the door is opened and closed.
* Wiring: A break or short in the wiring leading to the courtesy light is possible. This is more difficult to troubleshoot and requires tracing the wire from the switch to the light fixture. Look for any visible damage to the wiring harness, especially near the door jamb area where it flexes frequently. Corrosion is a common culprit in older cars.
* Ground: A poor ground connection can prevent the light from working. Check the ground wire connected to the courtesy light fixture and ensure it's clean and making good contact with a metal part of the car's body.
* Fuse (Less Likely): While unlikely if other lights work, a blown fuse specific to the courtesy light (if there is one dedicated just to that light) is a possibility. Check your fuse box diagram.
Troubleshooting Steps:
1. Check the Bulb: This is the absolute first step. Replace it with a known good bulb.
2. Inspect the Switch: Carefully examine the courtesy light switch on the door jamb. See if it's loose, damaged, or if its connections look corroded. Try wiggling the switch while someone checks if the light comes on.
3. Inspect the Wiring: Visually inspect the wiring leading from the switch to the light. Look for breaks, frays, or corrosion.
4. Check the Ground: Locate the ground wire for the courtesy light and clean it thoroughly. Ensure it makes good contact with bare metal.
5. Test with a Multimeter (Advanced): If you have a multimeter, you can test the voltage at the light fixture and at the switch to determine where the circuit is broken.
If you're not comfortable working with car electrical systems, it's best to take your Corvette to a qualified mechanic. They have the tools and experience to diagnose and repair the problem efficiently. Remember safety first when working with car electrical systems.
