passenger headlight help
Thread Starter
Instructor
Joined: Feb 2008
Posts: 211
Likes: 2
passenger headlight help
help wanted..i have a 70 vette. changed the vacuum hoses quite a while back so they are fine. last night the passenger side light would only come up a half an inch unless i helped it . went down just fine when i turned lights off. the drivers light works fine. i ASSUME the problem is with the passenger side light or between the passenger side light and the driver side light. i can't find my headlight troubleshooting book. can someone give me a methodical way to diagnose this problem before i just start replacing parts. limited experience so you can't be too basic. thanks for the help..matt
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
You will need a hand held vacuum pump to make it easy. With the engine off, disconnect the hose from the rod end of the right actuator and apply vacuum with your pump or even your mouth to see if it raises the light assembly or just leaks the vacuum out. If it leaks out it is probably the rod seal. It could also be a problem with the relay valve. Perhaps someone will chime in with a troubleshooting diagrahm.
Melting Slicks
Joined: Jun 2005
Posts: 2,239
Likes: 74
From: Palatine, Peoples Republic of Illinois
St. Jude Donor '09-'10-'11-12-'13-'14-'15-'16-'17-‘18
NCM Sinkhole Donor
I got some "T" connectors and some tubing and tried running both lights from a single vacuum relay. This help isolate the problem, and work so well I kept it that way. One less piece of rubber tubing running to the front of the car!
Thread Starter
Instructor
Joined: Feb 2008
Posts: 211
Likes: 2
You will need a hand held vacuum pump to make it easy. With the engine off, disconnect the hose from the rod end of the right actuator and apply vacuum with your pump or even your mouth to see if it raises the light assembly or just leaks the vacuum out. If it leaks out it is probably the rod seal. It could also be a problem with the relay valve. Perhaps someone will chime in with a troubleshooting diagrahm.
Thread Starter
Instructor
Joined: Feb 2008
Posts: 211
Likes: 2
would you please explain in further detail or furnish a diagram. sounds good but i can't picture what your'e talking about. will probably do it even if it is not part of my current problem...thanks
Race Director
Joined: May 2006
Posts: 16,528
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From: Dayton, Ohio
