Topic: Problems with lights
in Forum: C3 Electrical

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(The parking lights also are run thru the turn signal switch. This keeps the front turn signals from coming on when you mash the brakes.)
The park lights are fed from the "Tail" fuse in the fuse box. Use a voltmeter to test the fuse with it in the box, and the light switch on. Don't trust just looking at it, and thinking the fuse is good. Testing with a volt meter will tell you how much voltage there is at the fuse. It's possible there is a break in the circuitry in the fusebox, that keeps the "Tail" fuse from getting a full 12v.
If the fuse tests good, check for 12v on the brown wire at the switch, with the lights on. If there is 12v there, you have a bad connection for the park light circuit. The most likely place for this is the firewall "pass-thru", where the wiring goes from the inside to the under hood area. Of course, this wouldn't explain why the tail lights don't work. That's why it sounds like there is no power on the brown wire at the switch.
The dash lights are also fed from the light switch, on a dark green wire, to the fuse box(Inst. Lts), and out on a grey wire to the printed circuit board behind the cluster.
It sounds like there may be an issue with the fuse box, or the light switch, even tho you have replaced the switch.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Excellent advice above. And dead-on if someone hasn't messed with your car. Mine is a 79 and I had a number of lighting problems - the big one being that the headlights would just cut out at times. Finally got fed up when even putting in a new switch didn't work. Turned out the previous owner had apparently pulled/broken the wire to the instruments - and connected them to the headlight wire (big yellow if I recall). IN the process he had somehow created a short that burned the contacts in the headlamp dimmer switch - so i had multiple items to fix to get it right.
If the above advice from Adam's Apple doesn't work - check your wiring diagram (available on another thread here) and trace each one to make sure there is no re-wiring to fix! Some folks have tied in radios or CBs (remember those?) and all kinds of other junk to the lights, as the Corvette fusebox had a limited number of accessory hookups. Good luck.

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Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
