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

Headlights Stuck Open on my '84

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Old May 12, 2014 | 06:39 PM
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Default Headlights Stuck Open on my '84

Just bought the car over the weekend, want to get out some of the bugs. My headlights are stuck open and there's no vacuum lines running to the actuators. Can anyone give me a little knowledge here? Most appreciated.
'84 C4
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Old May 13, 2014 | 01:22 AM
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Originally Posted by Petes84
Just bought the car over the weekend, want to get out some of the bugs. My headlights are stuck open and there's no vacuum lines running to the actuators. Can anyone give me a little knowledge here? Most appreciated.
'84 C4
You asked for a little, so here ya go: Unlike a C3, the C4 headlights motors are electric not vacuum.
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Old May 13, 2014 | 01:47 AM
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This is the schematic for the 84.. A little more detail would help.. Do they start to open and stop, or have been stuck open??
[IMG][/IMG]

With the schematic, if you have a meter, you can check to see if you are getting power to the motors. If you need further help, post what you find..

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Old May 13, 2014 | 03:40 AM
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There are two cables going to each headlight, one for light power the other for open/close motor power.
Prior owner may have had trouble with the motors/gears/bushings and simply unpluged the motor power.
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Old May 13, 2014 | 10:19 PM
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Originally Posted by Ray Quayle
You asked for a little, so here ya go: Unlike a C3, the C4 headlights motors are electric not vacuum.
That's a pretty good little help answer Ray! ha ha-- And I did not know that....so thanks!

Now that you set me straight, I want to mention that I checked fuses and there isn't one marked 'headlights'. What should I look for electrically to get them to go up and down?
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Old May 13, 2014 | 10:52 PM
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From the drawing, you need to check for 12v on the red wires that go to the actuator relays and the grey wire that goes to the isolation relay.. All 3 relays are on support in front of LH wheel well.. If you don't have power on the 2 red wires you need to check the fusible links G and H by the bulkhead connector.. With the switch off you should have power on the grey wire of both motors and ground on the green.. With the switch on you get 12v on the green of both motors and ground on the white, you also operate all three relays..

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Old May 16, 2014 | 03:48 PM
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Originally Posted by ccrazor
From the drawing, you need to check for 12v on the red wires that go to the actuator relays and the grey wire that goes to the isolation relay.. All 3 relays are on support in front of LH wheel well.. If you don't have power on the 2 red wires you need to check the fusible links G and H by the bulkhead connector.. With the switch off you should have power on the grey wire of both motors and ground on the green.. With the switch on you get 12v on the green of both motors and ground on the white, you also operate all three relays..

Ahhhhhh.......no red wires at all, wth
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Old May 16, 2014 | 04:18 PM
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Originally Posted by Petes84
Ahhhhhh.......no red wires at all, wth
Did you find the three relays on support in front of LH wheel well?? Should be under a cover..

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Old May 16, 2014 | 06:40 PM
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If it's both, probably the relay. Go hunt down the Wheeler Dealers Corvette video on YouTube. He show ya how to fix it.


Found it

Last edited by LongBeachC4; May 16, 2014 at 06:44 PM.
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Old May 16, 2014 | 09:27 PM
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Might be informative if it was done in english, appears to be Swedish..

Last edited by ccrazor; May 16, 2014 at 10:14 PM.
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Old May 17, 2014 | 01:49 AM
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Originally Posted by ccrazor
Might be informative if it was done in english, appears to be Swedish.
They were SPEAKING English. Accent was a little heavy, though.

The wiring diagram shows three relays, but there were only two in the video. My car has three:

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