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Previously my 75 the headlights would not come up, so today I started working on them, I got them working but I shut car off they go up and down. On the vacuum line it is missing the little white stop valve could this be why it goes up and down when I shut engine off?
Hi Rogerl,
Headlights Working.... NICE!
The little white plastic item is a filter. I believe there should also be a gray metal 'one direction' valve. It should have one large hose going in and a large and small hose coming out.
That could be the cause of your trouble, or it could be a relay problem.
Regards,
Alan
My headlights also do that ( only work while the engine is running) I traced it back to my vacuum holding tank (coffee can) . It has tiny rust holes that bleed off the vacuum in seconds.