Question about 1990 GMC Sierra
Relays require two hot wires one to energize the solenoid that draws the contacts together inside the relay and the other hot wire to provide electricity that passes through the contact to the fuel pump. Obtain a electrical wiring schematic for the truck then identify the wire that should be hot and trace the wire to locate its source, check the wire for continuity and if the source electricity supply is present.
Posted on Sep 10, 2009
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Posted on Jan 02, 2017
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