Help with Temp guage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

heldonss · 10-11-2005, 07:40 PM

I have a problem with my temp gauge. I have 2 GM gauges and one Repop...same problem. I have had 2 sending units....both are suppose to be for gauges. My problem is that the needle goes to the Hot side. I just put the new Repop in and soon after I started my truck it went Hot. Any help is appreciated.

454 with aluminum heads.
Factory gauges.
Painless wiring.
.......

**pjmoreland** · 10-11-2005, 07:57 PM

Sounds like the green wire that runs from the sending unit to the gauge is probably shorted to ground somewhere. If the wire is shorted, the needle should move to "H" as soon as you turn your key to the "ON" position even if your engine isn't running.

Try unplugging the wire from your sending unit, and then turn the key on. If the gauge still goes to "H" then the wire is probably shorted. If the gauge doesn't go to "H" then your sending unit is most likely bad.

byrd · 10-11-2005, 08:00 PM

if you have a continuity tester you could check the wire to ground to see if it is grounded out and then all you would have to do then is find the short

Longhorn Man · 10-11-2005, 08:01 PM

Exactly. Folow the wire from the firewall to the sending unit. It is probably melted on an exhaust manifold or something.

10-11-2005, 07:40 PM	#1
heldonss Registered User Join Date: Sep 2002 Location: SEMO Posts: 74	Help with Temp guage I have a problem with my temp gauge. I have 2 GM gauges and one Repop...same problem. I have had 2 sending units....both are suppose to be for gauges. My problem is that the needle goes to the Hot side. I just put the new Repop in and soon after I started my truck it went Hot. Any help is appreciated. 454 with aluminum heads. Factory gauges. Painless wiring. ....... __________________ Current rides: 2007 Silverado VortecMax 1500 2007 Silverado Classic 1500 2004 GTO, 6spd 2003 Silverado 3500, 8.1 w/ Allison 2002 Camaro SS, 35th Ann., 6spd 2002 Silverado 2500, 6.0 1999 Buick Regal GS, 3800 SC 1997 Camaro Z28, 30th Ann. convertible 1991 GMC Syclone, #170 of 2998 1990 454 SS, 26,000 miles 1987 GMC 3500 Box Van 1972 Chevy C-10 short bed 1970 GMC Sierra Grande..2 owner 1968 Camaro RS/SS, 396/375 HP 1967 Chevy II Nova 1967 Camaro Convertible 1957 Chevy Truck Last edited by heldonss; 10-12-2005 at 05:20 PM.

10-11-2005, 07:57 PM	#2
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,426	Sounds like the green wire that runs from the sending unit to the gauge is probably shorted to ground somewhere. If the wire is shorted, the needle should move to "H" as soon as you turn your key to the "ON" position even if your engine isn't running. Try unplugging the wire from your sending unit, and then turn the key on. If the gauge still goes to "H" then the wire is probably shorted. If the gauge doesn't go to "H" then your sending unit is most likely bad. Last edited by pjmoreland; 10-11-2005 at 08:01 PM.

10-11-2005, 08:01 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Exactly. Folow the wire from the firewall to the sending unit. It is probably melted on an exhaust manifold or something.



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