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12-02-2012, 05:29 PM
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#1 |
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Registered User
Join Date: Oct 2012
Location: new branfules tx
Posts: 8
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1971 GMC temp gauge
i just installed a new speedo in the dash panel 1971 gmc works good ...but now the temp gauge goes all the way over past hot .. What did do?? the temp was woking fine untill i unplugged the wiring from the rear of the dash panel
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12-02-2012, 05:34 PM
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#2 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,251
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Re: 1971 GMC temp gauge
Was the battery disconnected when you pulled the dash apart? It sounds like your gauge took a spike and shorted out.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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12-02-2012, 05:56 PM
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#3 |
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Registered User
Join Date: Oct 2012
Location: new branfules tx
Posts: 8
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Re: 1971 GMC temp gauge
the gauge will go back to normal if i did connect the battery
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12-02-2012, 07:05 PM
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#4 | |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 1971 GMC temp gauge
Quote:
 Can you explain a little further? Does the gauge go back to normal if you connect or disconnect the battery?It may be shorted directly to ground. The sending unit acts as a variable resistor to allow more current as the temp goes up. Another problem could be the dash connector. It has a lot of flat lands that can get bent or broken when removing and reinstalling the connector. Be sure and check that carefully. If they looked damaged or broken you may have to replace the flexible circuit board.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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12-02-2012, 07:22 PM
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#5 |
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Registered User
Join Date: Oct 2012
Location: new branfules tx
Posts: 8
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Re: 1971 GMC temp gauge
yes i think it is grounded do not see where it is picking it up?/ the cconnector on the back plane looks good ?? if i remove batt. the gauge goes back to normal as soon as i complete the ckt it peg's looks to me like a solid grd??
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12-02-2012, 10:07 PM
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#6 | |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 1971 GMC temp gauge
Quote:
Turn the key on and see if gauge goes back to normal cold position with it disconnected. If it does, it's probably the sending unit gone bad. The sending unit is like a door to ground for the gauge. As the temp goes up it opens up more. If it's open all the way, the gauge is pegged on hot.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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