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saraajmele's avatar
saraajmele
Explorer
Jan 21, 2018

Repeat Cummins 5.9 electric lift pump failures

Hi our shops team has been tasked with troubleshooting a unit with repeat lift pumps failures. It’s on its fourth lift pump and all have have failed in less than a hour of run time. The chassis is a 1...
path1's avatar
path1
Explorer
Jan 21, 2018
Like mentioned above... I would do a ripple test on alt 1st. Diode failure common IE back feeding current and creating havic and messing up other elec. Not talking about how many volts alt is putting out but what is leaking back if you have any bad diodes. If OK then move on from there. Service manual has flow chart for going thru system. But wiring maps not easy to find.

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