Low volts to lift pump!! HELP
10-25-2006, 12:53 PM
#16
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I know it
and of course it rained today (in north Texas!! ) and I'm 200 miles away from my shop so I had to lay under the truck in my soaking driveway (Truck doesn't fit in the garage here!!) Oh well going for a test drive to make sure all is ok.
and of course it rained today (in north Texas!! ) and I'm 200 miles away from my shop so I had to lay under the truck in my soaking driveway (Truck doesn't fit in the garage here!!) Oh well going for a test drive to make sure all is ok.
10-25-2006, 12:57 PM
#17
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I found the culprit... After reading these posts and some other threads I found out about the ECM doing its pulsing thing to keep pressure down at startup. That would explain why my cheapo volt meter I am using couldn't keep up with the pulsing and only read 8.88.
Still had the problem of why the pump wouldn't run off of the harness. I have recently installed a vulcan kit that relocated it down by the tank. I traced through the harness and found a break inside the wire itself?? Not the connections, positive of that. actually cut them all off and tested again. If I put the smallest amount of pulling force on the wire the continuity was lost.
I ran a new harness and secured everything well. Seems to be working fine now. Pressure at idle is around 14-15psi. Thanks to all that gave their insight, we will see if any other problems arise...
Still had the problem of why the pump wouldn't run off of the harness. I have recently installed a vulcan kit that relocated it down by the tank. I traced through the harness and found a break inside the wire itself?? Not the connections, positive of that. actually cut them all off and tested again. If I put the smallest amount of pulling force on the wire the continuity was lost.
I ran a new harness and secured everything well. Seems to be working fine now. Pressure at idle is around 14-15psi. Thanks to all that gave their insight, we will see if any other problems arise...
10-25-2006, 01:01 PM
#18
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The vulcan harness. Not much of a harness two dodge lift pump connections and the 10 or 12 guage wire that goes inbetween. The break was in one of the 'inbetween' wires.
10-25-2006, 01:02 PM
#19
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we occasionally find breaks in the conductor (insulation and sheath intact) of high-temp wire right off the vendor's spool... used to drive us crazy back in the 90's before we realized how many products are manufactured on monday mornings and friday afternoons... 
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Racing_Joe66
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06-05-2007 02:32 PM