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Topic: headlights open at start up???/

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headlights open at start up???/ (1/13)
 11/16/06 6:48pm
philbshelb
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peckville, PA - USA

Vette(s):
1974 454 4 speed


Joined: 11/16/2006
Posts: 33

hi
i need some help. when i start the car my headlights open then close. i have just replaced the 2 relays, check valve, filter and override switch. they did not do this before they were just very lazy. any suggestions would be a help. it is a 74 454
thanks
phil
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headlights open at start up???/ (2/13)
 11/16/06 6:58pm
RADARB8Lifetime Member
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Montesano, WA - USA

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had a really nice one. sold it to a good friend. Purchased 2004 custom coupe in Feb. 2009 did not tell anyone here until August 2009. BAD I KNOW.


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DON'T KNOW IF THIS HELPS BUT CHECK THE SWITCHES UP UNDER THE DASH, THERE IS ONE THEY IS, IF I REMEBER, ON THE FIREWALL OR THE TACH, HARD TO FIND REPLACEMENT PART, GOT MINE FROM BLAIRS, I THINK. ANYWAY I HAD SAME ISSUE EXCEPT IT WAS MY WIPER DOOR, AFTER SERVERAL DOLLARS AND A SHOP THAT TOOK THE TIME, GET ALL MY VAC HOSES CORRECT AND FOUND SWITCH UNDER DASH WAS THE CULPRIT. GOOD LUCK HOPE IT HELPS, KNOW THAT ARE MANY HERE WITH DEEPER KNOWLEDGE, WELCOME TO THE WEBSITE.
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headlights open at start up???/ (3/13)
 11/16/06 7:04pm
philbshelb
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peckville, PA - USA

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1974 454 4 speed


Joined: 11/16/2006
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thanks for the help, and nice car
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headlights open at start up???/ (4/13)
 11/16/06 8:02pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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#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


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Are you saying they did NOT do this before you changed all the parts?
If the check valve is bad, the headlights would raise when you turn the engine off.
If the vaccuum lines are not connected to the relay valves properly, or if the valves are faulty, it could cause this.

The vac. lines on the relay valves should be:
Red on top
Yellow in the center
Green on bottom

Yellow is the main vac. source from the reservoir.
Red goes to the rear (hood side) of the actuators
Green goes to the front(bumper side) of the actuators.

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headlights open at start up???/ (5/13)
 11/18/06 11:54am
philbshelb
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peckville, PA - USA

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1974 454 4 speed


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no they did not do this before i changed the parts they were just very lazy. i did not check the new relays before i installed them.
phil
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headlights open at start up???/ (6/13)
 11/18/06 6:39pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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#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


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So....yer sayin YOU caused this, eh?

Double-check all yer vac. fittings for correct placement first. I have some vac. trouble-shooting info I can send you, if you need it. P/M me if you do...

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Joel Adams
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headlights open at start up???/ (7/13)
 11/20/06 6:38pm
philbshelb
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peckville, PA - USA

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1974 454 4 speed


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well i guess i caused it, thats my luck. it looks like all the hoses are where they should be.
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headlights open at start up???/ (8/13)
 11/20/06 7:30pm
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Duncanville, TX - USA

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#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


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If the hoses are all in the correct locations, then the check-valve, or the relay valves are not operating properly. It could be the hoses on the over-ride valve...maybe.
I sent you a P/M...the diagrams will be on their way in aboot 16 minutes and 38 seconds!

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Joel Adams
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headlights open at start up???/ (9/13)
 11/22/06 6:30pm
philbshelb
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peckville, PA - USA

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1974 454 4 speed


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joel
    i tried two check valves, the relays are new, but i guess they could be bad.
philConfused
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headlights open at start up???/ (10/13)
 11/22/06 7:08pm
whtlitninLifetime Member
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VENTRESS, LA - USA

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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.


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I had replaced the origional check valve on mine once and had similar problem. Took old valve and sprayed with wd 40 then put it back and cured door opening trouble. Lazy light was small hole in last light to open.
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headlights open at start up???/ (11/13)
 11/22/06 8:24pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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#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


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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.

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Joel Adams
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headlights open at start up???/ (12/13)
 11/23/06 9:47am
whtlitninLifetime Member
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VENTRESS, LA - USA

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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.


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Lazy light was a small hole in the boot, rubber seal around actuator shaft. Didn't read before I posted yesterday!
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headlights open at start up???/ (13/13)
 11/23/06 1:10pm
philbshelb
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peckville, PA - USA

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1974 454 4 speed


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Posts: 33

thanks guys. do i send the relays back, not sure if i can or will i just keep getting garbage relays????????
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