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Topic: Gauges go dead

in Forum: C3 Electrical


Gauges go dead

Posted: 3/21/04 8:40am Message 1 of 5
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LEXINGTON, KY - USA
Joined: 1/20/2004
Posts: 9
Vette(s): Black 77 coupe
I have been having problems with my gauges.When I turn the lights on all my gauges go dead except the temp. gauge.I put a new switch in it and it still doing it.Oh by the way they go dead even with just the parking lights on.Could it be the printed circut board? |cheers|


Rob N Lexington KY |URL=http://www.c3vetteregistry.com/member_uploads/5401_5500/5429/Vet11.jpg||IMG|http://www.c3vetteregistry.com/member_uploads/5401_5500/5429/Vet111.jpg|/IMG||/URL|
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Gauges go dead

Posted: 3/21/04 9:05am Message 2 of 5
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BINGHAMTON, NY - USA
Joined: 7/19/2003
Posts: 3808
Vette(s): ......
Your also having trouble with your picture ,nothing there but the infamous RED X


C3VR Lifetime Member #93

Gauges go dead

Posted: 3/21/04 9:59am Message 3 of 5
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HOUSTON, TX - USA
Joined: 11/15/2002
Posts: 296
Vette(s): 1976 L-48 coupe
Rob,
I would suspect a bad ground connection going to the cluster. It could be internal to the circuit board but I can't say. Are the instrument lights working?

|headscratch| |wavey|

|UPDATED|3/21/2004 9:59:10 AM (AZT)|/UPDATED|



Gauges go dead

Posted: 3/21/04 3:45pm Message 4 of 5
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San Marcos, TX - USA
Joined: 3/21/2004
Posts: 2
Vette(s): Previously owned '77 dark blue. Now have an '81 pearl blue beauty.
check the main plug in the back of the tach. it may be half way out.

neil


Gauges go dead

Posted: 3/21/04 10:41pm Message 5 of 5
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
This is a very common ground problem. What's an easy way to confirm it is turn on the parking lights, then turn the dash lights up and down, brighter and dimmer. If the ground is a problem, the gauges will move with the dimmer. The reason is the gauges ground backwards through the dash lights, and when the voltage is applied to the lights, the gauges lose their ground. Repairing the dash grounds fixes it. It could be at the printed circuit, the plug connection, or where the wire grounds to the chassie.

Ken Styer


in Forum: C3 Electrical


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