Onan 20.OES HELP


New member
I have Onan 20.OES-15R/11409A Ser#A830645738
It has a single Fault light on and will not crank,I need a manual
to help me,If I can get it running I would like to change it from 3 phase to single phase.
It has a 2.3L ford engine and is set up for LP
Any Help?
Last edited:
Manuals here: http://onan.xmsi.net/

Operators: 928-0122, Parts: 928-0222, Generator/control: 900-0335, Installation: 928-0601

Welcome to the STAK! :salute:

I believe on the back side of the A/C electrical box outlet cover, there is a silkscreened rewiring diagram.


New member
Thanks,BUT this one has only ONE fault lamp and it says FAULT under it,and it is on when the batt is conected?

Billy J Shafer

Feel free to come back anytime.There is a saying around here. No such thing as a dumb question. If you knew you wouldn't be asking.:D:D