Question about 1978 Chevrolet C1500
I need a chasis wiring harness diagram for a 1971 GMC c1500. The motor was rebuilt and an aftermarket temp. gauge attached on front of vehicle. I want to install a new sensor/switch, but do not know which wire from the wiring harness that plugs into the the instrument bezel to use. Thanks Richard
The factory wire to the factory gauge is a solid green wire. that year truck the sending unit usually mounted in the drivers side cylinder head but i have seen some in the passanger side if they have cut the wire and you can goto the main harness connector under the brake master cylinder and booster and find the only solid dark green wire and follow it forward to see how far it back they cut then just splice and run it to your new sending unit . If you want to check to make sure the gauge works after you find the solid green wire put it to a ground and the gauge should go to hot if it does not you have a bad gauge or a cluster wireing in side the truck and that is why they put the aftermarket gauge in .
Posted on Jun 01, 2009
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Posted on Jan 02, 2017
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