I also had an issue with mine sometimes not working..
I pulled the motor off the pump and opened it up.
The armature was really dirty and the brushes were a tad stuck.
I chucked up the armature up in my drill press and cleaned the commutator with a stone for cleaning the slip rings on the onan.
Then cleaned everything else up, the brushes were fine just after inspection.
I put it back together and bench tested the motor and reinstalled.
No issues since that time.
BTW the motor is the same one most pickup truck snow plow lifts use..
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Lynn, Guy & Rocky
2016 Newmar London Aire
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