Quote:
Originally posted by 79BIG10
... To take off the switch and cover the 2 nuts have to be taken off the rear of the cover behind the dash.
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From the 3 o'clock position this is #1 wire then so on till #5 for reference.
#1- Ignition wire (pink w/ black stripe)
#2- Valve wire (lt. green)
#3- Tank Aux. (lt. blue)
#4- Gauge (tan)
#5- Tank Main (tan w/ white)
#6- Not used
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Good info, but not for an 81-86 truck. GM changed the tank switches in 81 to a momentary type. They moved the gauge contacts from the switch on the dash to the solenoid valve on the right frame rail near the right fuel tank.
There are four wires that go to the harness on the dash. A +12v (pink) from the fuse box, two leads to the tank valve (light green and dark green) and a ground (black).
The valves do fail occasionally. One telltale sign is that it fails in the middle, causes the gauge sending wire to have an open circuit and the gas gauge goes past full scale high.
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Joe
'75 GMC Gentleman Jim
'84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter)
'85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans
also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '87 C10, '87 R30, 2 '89 R3500 Flatbeds
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