If the headlights on your 1977 Corvette are not functioning, one of four electrical components important to the headlight system may have failed: the headlight bulbs themselves; the fuse protecting the headlight circuit from power surges; the wiring harnesses bringing power to the headlights; or the headlight switch that allows the driver to turn the headlights on and off. Any one of these components may be the source of the issues you have with the headlights.
Tools Used: Voltmeter, Crescent wrench
Troubleshoot Headlights
Replace the headlight bulbs on the headlights not turning on. Replace the headlight bulbs by turning the Corvette off, opening the hood, disconnecting the rear wiring harness of the headlight assembly, removing the headlight socket and taking the old headlight bulb out of the headlight assembly. Test the replacement headlights. If they still do not work, continue to the next step.
Check that the fuses have not blown. Locate the fuse box on the left side of the engine compartment. Open the fuse box and inspect if the fuses operating on the circuit for the headlight that is not working are still functional. Replace as needed and test the headlights again. If they still do not work, continue to the next step.
Attach the negative lead of the voltmeter to the negative terminal of the Corvette's battery and connect the positive lead of the voltmeter to the positive lead of the wiring harness. The positive lead of the wiring harness is most likely the red wire. Replace the wiring harness if no power is coming through and test the headlights again. If they still do not work, continue to the next step.
Disconnect the negative terminal on the Corvette's battery. Remove mounting screw on the lower headlight switch mounting bracket with your screwdriver. Pry the headlight switch out of the dashboard trim enough to reach the wiring harnesses in the back. Remove the harnesses and check that the leads on the harnesses are clean. Clean and replace as needed. Test the headlights. If the headlights still do not work, replace the headlight switch.
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