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Vacuum Operated Headlights

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Old 06-11-2012, 07:17 PM
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benito
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Default Vacuum Operated Headlights

My headlights work VERY Slowly. Can not find leak. Should I look at the actuators or the relay. By the way, my 1969 has one relay like the 68's. Not one each as the 69 diagram indicates. My 69 was made in October 1968.

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Old 06-11-2012, 07:54 PM
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...Roger...
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Try pinching off the supply hose that goes over to the wiper door and see if that helps.
Old 06-11-2012, 07:58 PM
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John A F
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The passenger side head light on my79 would take about a minute and a half to come up. I replaced the right side relay valve and actuator. It was a little better but would still take 45 to 60 seconds to come up. Turned out the pivot joint was corroded. Sprayed it up with some penetration oil. It is still a little slower than the drivers side (which pops up immediately), but will come up in about 10 to 15 seconds. Should get better as the oil works its way into the joints.
Old 06-11-2012, 10:15 PM
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1986coupe
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Do you have a hand vacuum pump? If not then you should invest in one, especially as a C3 owner. They are relatively inexpensive and are so handy to have for headlights and brakes.

There is a site www.corvette-101.com that has a section on how to trace problems in headlights.
Old 06-12-2012, 10:09 AM
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jcloving
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I had similar issues. I replaced the actuator seals and that helped. I then rebuilt the relays and that solved my problem. My lines were good. Search for relay rebuild and you will find the threads. I added o-rings to the small shuttle in the relay and that improved sealing dramaticlly. Also, you can replace the felt filters to keep dirt out of the relays in the future.
Old 06-12-2012, 12:07 PM
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Easy Mike
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Originally Posted by benito
...Should I look at the actuators or the relay...
Relay first.
Old 06-12-2012, 12:13 PM
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540 vette
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I has issues with my system. Replaced everything and now it works perfect. It cost me around $300 for all the parts and a rebuild kit. You will nickle and dime yourself until everything is replaced anyway.
Old 06-12-2012, 07:49 PM
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benito
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Thank you all. Especially ROGER. I must have a leak in the winshield wipper vacuum part of the system. I plugged that side and the headlights worked great. Just picked up a vacuum pump to track down the leak.

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Old 06-12-2012, 07:51 PM
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benito
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You nailed it! Thanks.
Old 06-12-2012, 08:34 PM
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...Roger...
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Your Welcome ,glad that helped.
One of the first things I like to do on these systems is divide them up,makes things a little easier to understand and then find the leaks.

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