Quote:
Originally Posted by Bobby Dowdle
The 12 volt signal is sent from the control board. Control hosts is in the lower front. You can remove the coolant reservoir and follow the wires to plug. Try to unplug and plug back in. This might get it reset. If not, need to replace that board.
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Bobby is right and unfortunately control board issues on Onan 10K & 12.5K generators are not uncommon.
An easy test IF you can get to the fuel pump (it's located toward the lower back end of the generator on the driver side of the coach) is to use two additional lengths of wire to hot-wire the pump to a solid source of 12 volt power.
Easier than that is to jiggle the multi-wire connector where it connects to the control board while trying to prime the generator. If you hear the fuel pump start running when you do that, your problem is the control board.
Some owners have been able to resolve the problem by disconnecting the wire connector, spraying contact cleaner on the pins on top of the control board, then re-seating the connector. That didn't work for me when I had the problem with a 10K generator in a previous motorhome, so I ended up having to replace the control board.
Below is a photo of the original control board from that generator, which will provided a view of the pins to which the connector is attached.