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

Head light won't go down

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Old May 16, 2008 | 11:48 PM
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Default Head light won't go down

The left side head light motor on my 85, after 23 years of fathful service, died, so I installed a brand new one, it worked for about 2 weeks and now it will not go down, have to do it manually, I took the motor apart, and could not find any thing wrong, put it back in and it still won't go down, any help would be great, thanks
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Old May 17, 2008 | 12:17 AM
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Does the motor run, is it getting power, will the headlight go up???
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Old May 17, 2008 | 08:17 AM
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http://members.shaw.ca/dankai/Headlight%20Doors.pdf
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Old May 17, 2008 | 11:13 AM
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Originally Posted by 65Z01
Does the motor run, is it getting power, will the headlight go up???
Check all the obvious. Any shorts in the wires, are the connectors tight, etc...

By the way, 'wouldn't go down' is certainly a problem in my neck of the woods too.
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Old May 17, 2008 | 07:29 PM
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Yeah, the motor runs, head light goes up, just won't reverse to go down, will recheck everything, this going down thing seems to be an epidemic everywhere
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Old May 17, 2008 | 07:42 PM
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Does the motor stop running when the light goes up or continue to run?

You could unplug the headlight door controls and jumper the LH motor to the RH side to see if it operates; if so the problem is in the wiring or the controller.

Last edited by 65Z01; May 17, 2008 at 07:44 PM.
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Old May 17, 2008 | 08:41 PM
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once the head light is up the motor stops running, I'll try jumping it to the right side, thanks, that's a great idea
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Old May 18, 2008 | 12:28 AM
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My 86 did the same thing and in ended up being a relay problem. They are located under a cover in front of the front driver side wheel.
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Old May 18, 2008 | 12:52 AM
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Thanks, where did you buy the relay?
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Old May 18, 2008 | 01:45 AM
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Originally Posted by 85 paulie
Thanks, where did you buy the relay?
Be careful, the Right Hand headlight door motor gets the "Down" voltage from the isolation relay. Check Agent86's diagram. It's actually easier to follow along using the factory service manual. If you get one, it's easily the best investment for your car. Good luck.

Go here for fair priced GM parts with fast shipping:

http://www.tld-corvette.com/products.asp?dept=686
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Old May 18, 2008 | 09:34 PM
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I ordered it from zips. If memory serves me right it was the center relay of the 3 that is under the cover.
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