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Old 01-17-2019, 09:36 AM   #12
Bigdav160
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Join Date: Apr 2011
Location: Klein Texas
Posts: 3,326
Re: GMT400 Wiring Woes

If you didn't notice there is an inline fuse (on the firewall) for the fuel pump between the relay and the pump.

Yes, the oil pressure switch is just a redundant path to power if the relay fails.

Pretty simple circuit. It should be easy to fix
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