The 7.3 fuel pump on the left frame rail was replaced recently, I tested the power to the pump it has 6.7 volts, checked at the kill switch, I have 6.7 volts there I can not find the relay or trace the wire back to the sourse.
It is trace voltage, the pump had 450 OHMs resistance, new is .5 OHMs. The power control modual, sends out the voltage to check the circuit, if it is OK then it grounds the relay sending full power.
It took a while to figure all this out as information is hard to find.
Just a thought!
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