C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

headlights not working

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Old Mar 30, 2026 | 05:07 PM
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Default headlights not working

Hello
greetings from Italy. I recently bought a 91 conv, and the headlights are giving me problems. When I turn the switch on the dash...sometimes they work perfectly, sometimes just the pass side will rise and very rarely, nothing happens. The light will come on...but the motors seem to be dead. If I turn the adjusting **** near the motors, the headlight will work immediately and everythings works for a dozen of times, and suddenly they stop working. When they work they work perfectly...
Where is the problem? On the control module or shall I rebuild the adjusting part of the headlight motors? Please help, in Italy nobody knows where to put hands.
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Old Mar 30, 2026 | 05:56 PM
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Do you hear any grinding noise or clicking sound
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Old Mar 30, 2026 | 06:16 PM
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Normal noise....no grinding or whining
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Old Mar 30, 2026 | 06:27 PM
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If you get a voltage meter or probe light at the connector and if every time you turn it on/off it comes on then your motor can be on its way out
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Old Mar 30, 2026 | 10:54 PM
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Usually the drive bushings fail. When they do fail, they turn into powder. And because all the powder is still floating around in there, sometimes they will still work and the powder will drive the flip mechanism. And sometimes it won't. Most original drive bushings have failed at this point and need to be replaced.

People refer to them as drive bushings or pellets.


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Old Yesterday | 07:41 PM
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One other thing to try: Open the hood and operate the headlight switch so you can observe the black manual **** on top of the actuator. If the manual **** always spins when you actuate the switch but the headlights don't move (flip) consistently then this is very likely failed drive bushings as I mentioned previously. But if that manual **** is not spinning consistently, you might have a different problem.
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Old Today | 01:38 AM
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When I turn the headlight switch on...the **** doesnt move. If I turn the adjusting ****...the headlight works for several time. But if I let the car standing in the garage for a day....the headlight doesnt work anymore. So I turn the ****....and the headlight turns The light is always on...it is just the headlight that doesnt turn. When it opens or closes...I dont hear strange noises...and the movement is very quick and strong
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Old Today | 03:22 AM
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Originally Posted by BET VETTE
If you get a voltage meter or probe light at the connector and if every time you turn it on/off it comes on then your motor can be on its way out
My thought exactly.
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Not sure what the OP's problem is as it could be a couple of different things, so won't offer any conjecture here.

But, just as an aside, is there any reason why one couldn't fabricate their own bushings out of copper or brass or something a bit more sturdy so they don't crumble over time?

I know that they do make the brass gear.

Additionally, with so many owners swapping out their OEM headlights for the newer, much lighter LED ones these days, I think that'd take quite a bit of headlight weight itself out of the equation therefore alleviating much of the stress on the parts and allowing for a longer life of the vinyl bushings and gears, should one choose to continue running those.
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