headlight question again!
Thread Starter
Drifting
Joined: Feb 2001
Posts: 1,539
Likes: 63
From: new ulm mn
headlight question again!
What would cause a both headlights to slowly creep open partially and then slowly creep closed when you shut off the car?
Also, while digging around under the dash, I noticed that the white hose going from the over ride switch to the head light relay has been spliced twice under the dash. Did it come that way from the factory? Looks like something a previous owner messed up.
Also, while digging around under the dash, I noticed that the white hose going from the over ride switch to the head light relay has been spliced twice under the dash. Did it come that way from the factory? Looks like something a previous owner messed up.
Last edited by loflite; Apr 11, 2017 at 08:54 PM.
Drifting
Joined: Jul 2006
Posts: 1,259
Likes: 154
From: Deplorableville Nebraska
Viewing your profile, I see a '69 and a '76. Don't know which car you are referring to. A '69 only uses a single relay for the headlights which would give very similar symptoms in both headlight doors. If you still have the original headlight relay I would suspect that.
There should not be any cuts or splices to other components in the control vacuum hose going to the front relay.
There should not be any cuts or splices to other components in the control vacuum hose going to the front relay.
Thread Starter
Drifting
Joined: Feb 2001
Posts: 1,539
Likes: 63
From: new ulm mn
Viewing your profile, I see a '69 and a '76. Don't know which car you are referring to. A '69 only uses a single relay for the headlights which would give very similar symptoms in both headlight doors. If you still have the original headlight relay I would suspect that.
There should not be any cuts or splices to other components in the control vacuum hose going to the front relay.
There should not be any cuts or splices to other components in the control vacuum hose going to the front relay.
Thanks again.
Thread Starter
Drifting
Joined: Feb 2001
Posts: 1,539
Likes: 63
From: new ulm mn
No wiper door problems. I already replaced the check valve and filter. Tested the check valve before I put it in. Planning replacing the control vacuum line before I put it all together and see if it still does the headlight thing.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,850
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
If this is only on the headlamps then I'd suspect the vacuum relay is your issue. By default the system is designed to open if there is a failure. My guess is your system is losing vacuum and when you start it the relay position is in the "open" mode.
So if the relay has lost vacuum when you start the car, the doors will open and then as the car picks up vacuum, the top nipple will start pulling the plunger upward "lower" mode and pull the lamp downward.
Willcox
So if the relay has lost vacuum when you start the car, the doors will open and then as the car picks up vacuum, the top nipple will start pulling the plunger upward "lower" mode and pull the lamp downward.
Willcox
Last edited by Willcox Corvette; Apr 12, 2017 at 04:27 PM.
Thread Starter
Drifting
Joined: Feb 2001
Posts: 1,539
Likes: 63
From: new ulm mn
Thanks Willcox. I've used your a lot of products and your very helpful videos too. The headlight creep happens only when I shut the car off. I'll play some more with it tonight after work.
