Question about 1991 Chevrolet Silverado 2500
Take all remaining wires and "flash" them to a good ground with the ignition on. when you find the one that makes the oil pressure gauge move, that's your wire. Do not make a solid connection when doing this or you can damage systems served by the "wrong" wires. First look for the wire near the sending unit location...generally the wire leads coming out of the main harness are not very long. The problem with most schematics is that often they get the color wrong or they tell you a wire is there but don't say where "where" is. Also, if a fuse blows when flashing the wires, make a note of what wire went to that fuse (system) it will help with later wiring.
Posted on Aug 02, 2009
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Posted on Jan 02, 2017
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