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Username Post: Temperature gauge        (Topic#375013)
78 Custom Deluxe 20 
Posts: 19

Age: 66
Loc: Pico Rivera, Calif
Reg: 08-12-17
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

"6th Year" Gold Supporting Member
Posts: 4648
Loc: Fairfax, Va
Reg: 12-21-00
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.


If I recall correctly my memory is excellent. My ability to access it is not.

Silver Supporting Member
Posts: 6632
Age: 62
Loc: Kansas
Reg: 02-16-03
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!

Member #271 Senior Chevytalk Moderator
Posts: 26041
Loc: Austin, TX 78748
Reg: 05-09-00
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

78 Custom Deluxe 20 
Posts: 19

Age: 66
Loc: Pico Rivera, Calif
Reg: 08-12-17
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

78 Custom Deluxe 20 
Posts: 19

Age: 66
Loc: Pico Rivera, Calif
Reg: 08-12-17
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.

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