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1993 Corvette base coup head light motors run on after executing command for 5-10 seconds, opening and closing

by Charles H. White
(Shen. Jct. WV, USA)

1993 corvette headlight motors continue to run after executing opern or colose commands. then secure operation. Lamp nodules/assemplies operate promptly and completly. This occurs when either the head light or the parking lights are selected. What is the problem and how is it repaired?

Thanks,

Charles

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Apr 13, 2012
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starstarstarstarstar 		1993 Corvette base coup head light motors run on after executing command for 5-10 seconds, opening and closing
by: Charlesnonymous

FWIW: I have continued to work on this issue. The FSM doesn't seem to directly address this specific issue or at least I don't read it that way.

However, in reflecting on the mercury limit switches possibly being out of position I had the head light assemblies removed from the car to access the cover plate on the base of the "motors" to assess the expected failure/position error of the switches.

Removing the actuating gear cover to remove the nylon drive gear we found fine shavings from the nylon gear face. (No, I never though of this old trouble/problem before this effort to look at the mercury switches). In reviewing the situation it seems that this is a common result when the three "bushings" fail and allow the nylon gear to slowly eat its self to death. Replacement is a nylon three(3) bushing kit and either a nylon drive gear or a brass one. The decision was fairly straight forward for me, 19 years of service life on the nylon. Nylon costs 30% of the brass. The "bushings" are self sacrificing over time so they WILL HAVE TO BE REPLACED any way so replacement with near OEM components. Labor costs are the same for changing nylon bushing with a nylon gear or a brass gear.

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