1 Headlight delayed on closing
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
1 Headlight delayed on closing
They both open fast together but when I shut them off the left one closes right away but the right one closes about 30 seconds later.
It sounds like it doesn't get power until then.
86 vert
thanks
It sounds like it doesn't get power until then.
86 vert
thanks
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
I'll check it out
It's safe to open and close the headlights with the hood open right?
If the voltage doesn't appear until when it closes that means what?
I guess if the voltage is present from the time I switch the lights off then the motor's dragging?
If the voltage doesn't appear until when it closes that means what?
I guess if the voltage is present from the time I switch the lights off then the motor's dragging?
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
Yes, you can operate the headlights with the hood open. Listen carefully to see if the right side motor is running right away, but just not closing. If that is the case it is the gears in the HL motor. Otherwise it is likely one of the relays in the headlight control module.
Melting Slicks
Joined: Mar 2008
Posts: 2,453
Likes: 346
From: SC
I had a similar problem with my 87. If voltage is OK, try slightly turning the manual ****. If it opens, then it could be the motor jamming or gears. My problem was the magnet inside the motor was broken in half and jamming the motor from spinning. I super glued it back together, and then epoxied it back to the housing. Also replaced the gears while I had it apart. works fine now. Of course, you have to take it all apart to see what is going on inside so I would make sure all is OK with it getting power first.
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
No ... there's always a 20-30 second delay
Yes, you can operate the headlights with the hood open. Listen carefully to see if the right side motor is running right away, but just not closing. If that is the case it is the gears in the HL motor. Otherwise it is likely one of the relays in the headlight control module.
Where abouts is the headlight control module?
Thanks
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
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Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
If there is an audible grinding sound, you may have the plastic gear trouble......if you can push the headlight and get it started and then it completes its task on it's own then it is electrical which includes the Motor being old and weak.
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
Search is my friend
'84 to '87 has the three relay setup not the expensive headlight control module of the later C4's.
Would anyone have the schematic for the headlights for an 1986?
Thanks in advance
Would anyone have the schematic for the headlights for an 1986?
Thanks in advance
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
2 control relays 1 isolation relay
There are 2 motor control relays 1 isolation relay setup using relay ladder logic. I don't even know where they are located. 
Anyone?
Thanks
Anyone?Thanks
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
found tech instructions
For the 2 headlight motor control and isolation relay on 84-87 -- MAM sells the relays too. 
http://content.mamotorworks.com/pdf/601723.pdf
http://content.mamotorworks.com/pdf/601723.pdf
Pro
Joined: Mar 2009
Posts: 639
Likes: 1
From: Brookfield CT NCM#522998
For the 2 headlight motor control and isolation relay on 84-87 -- MAM sells the relays too.
http://content.mamotorworks.com/pdf/601723.pdf
http://content.mamotorworks.com/pdf/601723.pdf
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,830
Likes: 147
From: Gainesville FL
I'm going to try all the simple fixes first
I have a similar problem on my 86, but I know that it is just the housing rubbing on the body. There is a little 'rash' near the right headlight on the bumper; the PO obviously hit something jsut enough to twist the housing slightly. It opens just fine, but closes a little slow and a little late. Sometimes it wont close at all and have to push it a little with my hand and then it closes right up. Myabe something to check; I always try to go for the easy solution first before ripping stuff apart!
