Question about GMC Sierra 1500
Using a test light, unplug the lift pump and jumper across the electrical terminals. Have someone turn on the key,you should have a light. No light means the oil pressure switch is a possible cause of the no start.
At the oil pressure switch jump the orange wire to the gray wire with a fused wire. your test light at the lift pump should turn on with the key on. This proves the oil switch is a problem. Then plug in the lift pump connector, it should come on. If not the lift pump is bad.
Posted on Sep 07, 2009
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Posted on Jan 02, 2017
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