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**hatzie** · 12-02-2019, 04:05 PM

Usually the intermittent is the tank to frame ground wire but the 1980 and older dual tank switch can do this too.
The tank still makes contact through the straps sometimes hence the intermittent function. The switch will do similar things but I'd check the tank ground first.
Next time it presents the needle in the 3:00 position grab some jumper cables and hook the pinch weld on the tank to a clean spot on the frame with them. Betcha it gets all better. It may stay that way when you remove the jumper cables just to mess with your head.

12-02-2019, 04:05 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: 1980 Fuel gauge pin out. Usually the intermittent is the tank to frame ground wire but the 1980 and older dual tank switch can do this too. The tank still makes contact through the straps sometimes hence the intermittent function. The switch will do similar things but I'd check the tank ground first. Next time it presents the needle in the 3:00 position grab some jumper cables and hook the pinch weld on the tank to a clean spot on the frame with them. Betcha it gets all better. It may stay that way when you remove the jumper cables just to mess with your head. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.