99 frc headlight problem.
Thread Starter
Racer
Joined: May 2006
Posts: 415
Likes: 0
From: Dallas TX
99 frc headlight problem.
The lights were working fine and one night I got in and turned them on, they flipped up but no lights came on. I flipped them up and down 10 times and they finally came on. The Following night it started doing the same thing only this time they will not come on at all. Since they both went out I don't think its a bulb problem. The brights work fine and this is the only way to see at night..I think it bothers other drivers. Any help would be great. 
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
Do you hear anything when you turn them on? Such as a motor working? Could be the gears, worse case a motor.
BTW, I have a set (pair) of lights fully assembled for sale.
BTW, I have a set (pair) of lights fully assembled for sale.
Thread Starter
Racer
Joined: May 2006
Posts: 415
Likes: 0
From: Dallas TX
They flip up and down fine, and the brights work fine, it is only the low beams that will not come on?
Race Director
Joined: Aug 2003
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From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
Check mini-fuse #10 at the underhood fuseblock. It is labeled HDLOBML. You can also check that terminal with the fuse out and the headlights on with a DVM. Check between the terminal and ground and you should see something between 10vdc and 14vdc.
Another thing to check is the harness that connects the headlamps to the system that sits on top of the inner fender on each side. Make sure your connections are clean and tight.
Another thing to check is the harness that connects the headlamps to the system that sits on top of the inner fender on each side. Make sure your connections are clean and tight.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Check mini-fuse #10 at the underhood fuseblock. It is labeled HDLOBML. You can also check that terminal with the fuse out and the headlights on with a DVM. Check between the terminal and ground and you should see something between 10vdc and 14vdc.
Another thing to check is the harness that connects the headlamps to the system that sits on top of the inner fender on each side. Make sure your connections are clean and tight.
Another thing to check is the harness that connects the headlamps to the system that sits on top of the inner fender on each side. Make sure your connections are clean and tight.
Good advice
If that doesnt work it may be the switch
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Racer
Joined: Jan 2006
Posts: 479
Likes: 2
From: Hollywood Maryland
Check the ground also
Open the hood. Remove the painted headlight covers. Pull the offending bulb socket, using a multimeter, put red lead in '+' connector and black lead in '-' or ground connector on socket. Turn on lights to see if you get power to the socket. If not, remove and touch the black lead to ground (metal on chasis), turn lights on again and see if you have power. If so, then you may have a ground problem to the head light circuit. Bill Curlee has excellent guidance on cleaning up grounds.
Good luck,
Good luck,
Thread Starter
Racer
Joined: May 2006
Posts: 415
Likes: 0
From: Dallas TX
quick question are there 2 different bulbs for the low beam and high beam? The high beams are in the center and they come on, I can only see one plug in the back, I pulled that theres three slots where it plugs in on that connector I dont think this is what I need to test for? I dont know where the offending socket bulb is..
Le Mans Master
Joined: Feb 2003
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From: The line waiting to see Santa Claus stretched all the way back to Terre Haute, and I was at the end, Indiana
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18
Loose ground on the the low beam circuit maybe?