85 Headlight question
Thread Starter
Heel & Toe
Joined: Mar 2013
Posts: 23
Likes: 0
From: Scott AFB Illinois
85 Headlight question
Quick question and hopefully easy answers.
When I turn on the headlights they will not immediatly flip up. I have to turn them off and wait a minute or two and then turn them on and they will eventually flip up. Is this something that can be adjusted or is this normal operation.
Also, on the top of each headlight motor there is a **** that you can twist. What does it do?
Thanks
When I turn on the headlights they will not immediatly flip up. I have to turn them off and wait a minute or two and then turn them on and they will eventually flip up. Is this something that can be adjusted or is this normal operation.
Also, on the top of each headlight motor there is a **** that you can twist. What does it do?
Thanks
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
Here is the schematic for the 84.. If you unplug the motor, either side, you should have 12v on the grey wire and ground on the green (always powered with switch off).. When you operate the light switch you should have 12v on the green and ground on the white.. The **** is to manually open or close the headlight door.. If the motor is trying to run, it sounds like time for new gears..
http://forums.corvetteforum.com/c4-t...placement.html
http://forums.corvetteforum.com/c4-t...placement.html
Last edited by ccrazor; Apr 7, 2013 at 02:21 PM.
Thread Starter
Heel & Toe
Joined: Mar 2013
Posts: 23
Likes: 0
From: Scott AFB Illinois
I don't think it is the gears due to not hearing them try and open up. They open just fine smooth and even, it just takes them a minute to do so. I haven't used a stop watch, but it takes them the same amount of time each time I try and turn them on.
Is there any type of adjustment on them? It almost acts like they are operate on vacuum or something and you have to wait for the vacuum to build in order for them to operate properly. I don't know.........
Is there any type of adjustment on them? It almost acts like they are operate on vacuum or something and you have to wait for the vacuum to build in order for them to operate properly. I don't know.........
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
They should open as soon as the switch is operated.. As suggested disconnect and check voltage. As soon as you operate the light switch you should have 12v on the green and ground on the white, and if you reconnect it should open right away..
Thread Starter
Heel & Toe
Joined: Mar 2013
Posts: 23
Likes: 0
From: Scott AFB Illinois
Ok, it took me awhile to get it checked, but here are the results.
With the switch/engine turned off and motors unhooked, I am getting 4V at both wires..green/grey.
With the switch turned on and engine running with motors unhooked, I am getting 6V on both wires.
Not sure what I need to check next.....I tried turning headlights on and the came right up no problems (this time).
With the switch/engine turned off and motors unhooked, I am getting 4V at both wires..green/grey.
With the switch turned on and engine running with motors unhooked, I am getting 6V on both wires.
Not sure what I need to check next.....I tried turning headlights on and the came right up no problems (this time).
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
With the motor disconnected power off or on you should have no voltage on the green, and 12v on the grey. If you connect the meter one lead to the green and the other to the grey 12v.. With the meter connected to the white and the other to green you should get 12v, light switch on, don't need it running. If anything different, put one lead on the white the other on the + of the battery, this checks for a good ground. Put one lead on the green and the other on - of the battery, checking for good 12v on the green..
Last edited by ccrazor; Apr 18, 2013 at 09:10 PM.
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Thread Starter
Heel & Toe
Joined: Mar 2013
Posts: 23
Likes: 0
From: Scott AFB Illinois
I did check the voltage as you are saying and I was only getting 4 volts on the grey wire (light switch off) and 6 Volts with the light switch on.
You are saying there is a "white" wire as well? I am not seeing that wire...only the green and grey wires.
I haven't checked the for good ground or 12 volts using the battery yet, but I will.
You are saying there is a "white" wire as well? I am not seeing that wire...only the green and grey wires.
I haven't checked the for good ground or 12 volts using the battery yet, but I will.
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
I'm using the colors off the 84 schematic, but the colors going into the motors s/b the same as 84 - 87 motors are inter-changeable.. What is the color of your third wire??
Melting Slicks
Joined: Feb 2005
Posts: 2,057
Likes: 5
From: Bay Shore, NY
I have a similar problem with my 85. When I pull the light switch out all the way, the headlights light, but do not rotate. I will then push the switch all the way in and then pull it out again and headlights will come on and rotate up. It's always been like this since I bought the car. Then one of the motors went south and needed to rebuilt. Upon inspection, I found the headlight motors were changed to the later design which I think is a 2 wire design and the older one was 3, but I'm not sure. Anyway, I figured the lights worked this way because of the swap and something was mis-wired somewhere.
Thread Starter
Heel & Toe
Joined: Mar 2013
Posts: 23
Likes: 0
From: Scott AFB Illinois
I am guessing the PO replaced the headlight motors due to only having 2 wires going to the motors. They are Green and Grey...........
I am having the same problem as member ejscarfo described in his reply....not sure????
I am having the same problem as member ejscarfo described in his reply....not sure????
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
Last edited by ccrazor; Apr 21, 2013 at 12:29 PM.