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Topic: headlights open at start up???/

in Forum: C3 General Discussion


headlights open at start up???/

Posted: 11/22/06 8:24pm Message 11 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
This really sounds like the relay valves are the problem. There is a spring in the valves that keeps the valve in one position, until vaccuum is routed to it to move it. This is supposed to make the "closed" position of the headlites/wiper door the "default" position. If the spring is weak/bad, then it would allow vaccuum to the wrong side of the actuators on start-up, and the lites will raise...until there was enought vac. in storage to move the relay valve back to the closed position, and then the lites will go back down.

btw..."New" don't mean doo-doo on these valves.


Joel Adams
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headlights open at start up???/

Posted: 11/23/06 9:47am Message 12 of 13
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VENTRESS, LA - USA
Joined: 10/8/2003
Posts: 87
Vette(s): 1971 Blue Roadster, sb400, cam, electronic ignition,10 disc CD changer, 2.5" chambered exhaust, 3.36 rear,tremec 5 speed from Classic Chevy, fiberglass rear spring and vintage air.
Lazy light was a small hole in the boot, rubber seal around actuator shaft. Didn't read before I posted yesterday!


headlights open at start up???/

Posted: 11/23/06 1:10pm Message 13 of 13
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peckville, PA - USA
Joined: 11/16/2006
Posts: 33
Vette(s): 1974 454 4 speed
thanks guys. do i send the relays back, not sure if i can or will i just keep getting garbage relays????????


in Forum: C3 General Discussion


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