Voltage readings at lift pump lead

Voltage readings at lift pump lead

11-11-2009, 02:20 AM

#1 (permalink)

Gordon Maney

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Join Date: May 2001 Location: Iowa Posts: 387

Voltage readings at lift pump lead

I purchased the same kind of connectors used at the lift pump connections and made up some test leads. [This is on a 2001 HO 24V Cummins.]

Taking a voltage reading at the lead that powers the pump I get 6.56 volts and it does not stop after 20 seconds. You turn on the key and it is 6.56 volts for as long as you stay there.

With the key off you get .156 volts.

I considered powering up the pump with my other lead; connecting directly to the battery, to test the pump, but after reading the 6.56 volt reading I wondered if the pump was actually powered by 12 volts. I did not jump the pump that way as I did not want to damage it.

Thoughts on this 6.5 volt reading?

__________________
2001 Quad Cab, 3/4 ton 4x4, High Output Cummins, 6 speed, 255-85-16 Cooper Discoverer ST tires, rubber cab floor covering

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