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73-87 Chevy _ GMC Trucks => Interior & Equipment => Instrumentation => Topic started by: SILSquarebody on August 04, 2024, 08:11:32 pm

Title: Fuel Guage
Post by: SILSquarebody on August 04, 2024, 08:11:32 pm

I bought an 86 K5. I am slowly working thru all the problems with it. The gas guage show it is way over full when you start it. Can someone tell me what color the wires are for the fuel guage please? Ground problem? Or what you think?

Title: Re: Fuel Guage
Post by: bd on August 05, 2024, 10:56:05 am

1986 Factory Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_352_86_1986_Chevrolet_GMC_Light_Truc_Wiring_Manual_CK_10_30_Only.pdf)

Functional Tests of Factory GM Electric Gauges (http://forum.73-87chevytrucks.com/smforum/index.php?topic=25339.msg211241#msg211241)

Does the fuel gauge needle point at ~3:00 o'clock position and remain there continuously with the ignition switched ON or does the needle drop normally while driving?

Title: Re: Fuel Guage
Post by: SILSquarebody on August 05, 2024, 04:57:53 pm

Yes it does stay at 3 o clock.

Title: Re: Fuel Guage
Post by: bd on August 05, 2024, 05:07:40 pm

There's an open in the signal circuit from the sender, or the sender rheostat in the fuel tank is open, or the sender isn't properly grounded.  For wire colors and routing, refer to the linked factory wiring manual.

Title: Re: Fuel Guage
Post by: SILSquarebody on August 05, 2024, 06:51:12 pm

Where do I find the wiring manual?

Title: Re: Fuel Guage
Post by: SILSquarebody on August 05, 2024, 06:55:48 pm

NVM I found it. Thanks.