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73-87 Chevy _ GMC Trucks => Interior & Equipment => Instrumentation => Topic started by: jsc on May 17, 2019, 10:32:48 am

Title: Temp gauge
Post by: jsc on May 17, 2019, 10:32:48 am

I have an '83 C10 with a new temp gauge, new printed circuit, and supposedly new wiring.  However, it has pegged out, and stays there, even after the engine and truck has cooled down.  Even when I start it again it doesn't move from that position.  The truck is not running hot.  Is this a ground issue?  Or what? 

Thanks

John

Title: Re: Temp gauge
Post by: bd on May 17, 2019, 10:38:16 am

Recheck the wiring.  Either the gauge is connected incorrectly or the sender lead is grounded.

Title: Re: Temp gauge
Post by: Captain Swampy on May 18, 2019, 08:31:38 am

Could be a sender for a light instead of for a gauge.

Title: Re: Temp gauge
Post by: jsc on May 20, 2019, 05:41:06 pm

Not sure what you mean by an incorrect sender.  BUT today I ran the truck, and the gauge had dropped to the cooler side.  I had fiddled with the wire under the hood.  Maybe that was it? 

Title: Re: Temp gauge
Post by: JohnnyPopper on May 20, 2019, 06:20:31 pm

It was probably shorted to ground- that's supposed to make it peg hot.

Good way to test a temp gauge if you need to. 

Title: Re: Temp gauge
Post by: bd on May 20, 2019, 06:52:55 pm

Was the sender wire laying against the exhaust manifold and melted?  Inspect the full length of the wire between the firewall bulkhead connector and the sender for chaffing around sharp corners or brittleness and heat damage.