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Topic: Gauge grounding issue

in Forum: C3 Electrical


Gauge grounding issue

Posted: 5/28/05 5:57am Message 1 of 3
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HURRICANE, UT - USA
Joined: 1/11/2004
Posts: 119
Vette(s): 1978 L82 4 speed Black on Black vin12231 BDay Nov 7 1977 1966 327 Roadster BDay May 18, 1966 (next project)

Last night took the vette out for a ride and when I turned on my parking lights (and headlights) all the gauges grounded out (pegged lowest readings)  except the temp gauge.  It shouldn't be the light switch since i just installed one over the winter.  Before i tear apart the dash for the 5th time i wanted to make sure it is not something in the console.

I do have the schematics and the circuit for these gauges is the same for the console lights but the lights work fine.  Any thoughts are appreciated.

--Eric




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Gauge grounding issue

Posted: 5/29/05 8:26pm Message 2 of 3
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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!

It's a bad ground from the gauges.  They are grounding through the light circut, but when you turn on the lights, the ground becomes a hot and the flow stops, and the gauges drop.

You can vary the gauge readings by turning the dimmer up and down.  Try it.  When that happens, fix the gauge ground.




Gauge grounding issue

Posted: 5/30/05 5:49am Message 3 of 3
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Waterford, MI - USA
Joined: 9/13/2002
Posts: 1754
Vette(s): 1973 Red coupe
I had the same issue when I first bought my 73. The PO had installed a new radio and didn't hook up the ground properly. I added a ground wire to the back of the gauge cluster and everything is fine. Redwingvette38502.2444791667


Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans
Borgeson Steering box
 


in Forum: C3 Electrical


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