Headlight help
Thread Starter
Cruising
Joined: Jul 2008
Posts: 12
Likes: 0
From: Omaha NE
Headlight help
I just finished replacing the actuators on my '74. Used a vacuum tester and it seems the vacuum is good. When I turn the headlights on, they try to open, but just a bit. So I give them the old manual assist. When I park and turn the lights off, the passenger side light goes down as it should, but the driver's side doesn't, Anyone have any suggestions?
Thanks.
Thanks.
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
if the hoses aren't leaking and you're getting proper vaccum, the actuators must be leaking. get new seals from one of the supply houses. hardest part is removing the assemblies from the car.
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
it's possible that the headlights are binding, but not likely. when you say the vaccum tested ok, did you test the vaccum on the opening and closing hoses? if that is ok, the problem has to be the headlights. if that's not ok, check the vaccum relay(s). then check the control and vaccum lines to the relay. it's just a matter of working thru the system. dr. rebuild has a trouble shooting paper on the vaccum sysytem, and i'm sure willcox also has one.
Le Mans Master
Joined: Aug 2006
Posts: 7,419
Likes: 1,555
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Did you replace the actuators or replace the seals?
I've posted this troubleshooting guide before www.corvette-101.com/vacuum.htm and it may help you find the problem, the text is good but the diagram is bad so use the one I posted or the one from Willcox. Our 74's have a cylinder at the front of the car not a coffee can. If you get stumped post back, at least our 74's don't have a wiper door! PG.
