78 Custom Deluxe 20
Newbie
Posts: 19
Age: 66
Loc: Pico Rivera, Calif
Reg: 08-12-17
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05-13-24 11:31 AM - Post#2869794
Hi, I have a question on the temperature gauge on a C20 pickup with a 350. I recently had the radiator repaired and after I reinstalled it the gauge does not work. I put everything back as it should be, what controls the gauge? Thanks, Albert
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 ss3964spd
"6th Year" Gold Supporting Member
Posts: 4672
Loc: Fairfax, Va
Reg: 12-21-00
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05-13-24 01:02 PM - Post#2869800
In response to 78 Custom Deluxe 20
Albert, the gauge is probably electric and is likely controlled by a single wire from the temperature sensor on the engine. Ensure that wire is correctly connected to the sensor.
Dan
If I recall correctly my memory is excellent. My ability to access it is not. |
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 fritz1990
Silver Supporting Member
Posts: 6637
Age: 62
Loc: Kansas
Reg: 02-16-03
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05-13-24 08:59 PM - Post#2869817
In response to ss3964spd
Assuming it’s a 78 from your SN, the sender is on the drivers side head. It will be between #1 and #3 plugs. The wire is most likely green.
Ground the wire with ignition in the ON position, truck not running. The gauge should peg HOT on the gauge with the wire grounded. If it does change sender. If not you have s bad gauge or wiring problem.
Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.
Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1, 2007 C6 Love this one! Now have 2014 C7
Don't have a nervous come together!
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 gchemist
Member #271 Senior Chevytalk Moderator
Posts: 26062
Loc: Austin, TX 78748
Reg: 05-09-00
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05-14-24 03:59 AM - Post#2869820
In response to fritz1990
fritz1990 is correct. My truck has a green wire to the sensor. Mine also uses another temp sensor in the right head. It controls the dual cooling fans.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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78 Custom Deluxe 20
Newbie
Posts: 19
Age: 66
Loc: Pico Rivera, Calif
Reg: 08-12-17
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05-14-24 08:54 AM - Post#2869831
In response to gchemist
Thanks for the information, I will check and repair any issues I come across. Thanks, Albert
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78 Custom Deluxe 20
Newbie
Posts: 19
Age: 66
Loc: Pico Rivera, Calif
Reg: 08-12-17
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05-17-24 07:46 AM - Post#2869970
In response to 78 Custom Deluxe 20
Boy, do I feel dumb. I finally had time to look at it and the wire was disconnected :shifty :
I cleaned it up and now the gauge is working.
Thank you for your help, now on to the fuel gauge.
Albert
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