Headlight help
Thread Starter
Intermediate
Joined: Jan 2009
Posts: 32
Likes: 0
From: KS
Headlight help
My headlights on my 74 coupe only come up about a 1/4 inch when I turn them on. I have replaced all vacuum hoses, check valve, head light warning switches, and the 2 link spring on the pass. side. I get 19inches of vacuum to the vacuum tank, but only 5 inches to the actuators. could this be bad relays? If I hook manifold vacuum to the actuators the headight go up and down great, but I'm not sure which parts to replace! Thanks in advance.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
How much vacuum do you get to the relay valve? Will they open with the manual over ride under the dash? Here is a link to a trouble shooting guide that may help.
Gary
http://www.corvette-101.com/
Gary
http://www.corvette-101.com/
Racer
Joined: Sep 2008
Posts: 403
Likes: 7
From: Space Coast Florida
Keep troubleshooting! My problem is a bad relay valve, it opens fine, but the rubber o-ring at the bottom has a hole in it and causes a big leak for the system which reduces it to nothing. Keep up the checks and you'll get it eventually.
For the lack of vaccum to relays: You replaced the hosing so there's no leak there, I'd check the reserve tank for a hole or the actuators themselves.
For the lack of vaccum to relays: You replaced the hosing so there's no leak there, I'd check the reserve tank for a hole or the actuators themselves.
Le Mans Master
Joined: Jan 2007
Posts: 5,485
Likes: 7
From: Peekskill NY
The actuator seals can be replaced, all the vendors sell them.
In your spare time just for fun, try to rebuild the old relays and if you're successful, you'll have a spare pair.
Glenn
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Thread Starter
Intermediate
Joined: Jan 2009
Posts: 32
Likes: 0
From: KS
I've been making a photo album of my car since I got her. As sson as she is painted I'll post all the pics. 74 coupe with 60826 original miles in need of a little TLC, but its all factory. I can't thank you guys enough! I've learned so much about the c3 since i joined. You've made my job alot easier! Kelly