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Rich Biebel · 10-05-2014, 02:53 PM

Ok David that is an old gas unit..

Has points and condenser and a coil and all that has to be good.
The engine has a low oil pressure switch. That could be your problem. Some were 2 terminal and close with pressure. That completes the 12v power for the ignition. If it has a 2 wire switch you can jump it and see if it runs with it jumped out. The switch is mounted above the oil filter on most of the old flathead Onan engines...

The switch can be tested with an ohmmeter. Whatever it reads engine off......it should be the opposite running.

N/O = normally open.....and that should close running
N/C = normally closed...and that should open running

2 wire closes or opens across the 2 terminals
1 wire closes or opens to the switches body....which will be grounded at the engine when it is screwed in.

10-05-2014, 02:53 PM	#5
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Onan Aux Issue Ok David that is an old gas unit.. Has points and condenser and a coil and all that has to be good. The engine has a low oil pressure switch. That could be your problem. Some were 2 terminal and close with pressure. That completes the 12v power for the ignition. If it has a 2 wire switch you can jump it and see if it runs with it jumped out. The switch is mounted above the oil filter on most of the old flathead Onan engines... The switch can be tested with an ohmmeter. Whatever it reads engine off......it should be the opposite running. N/O = normally open.....and that should close running N/C = normally closed...and that should open running 2 wire closes or opens across the 2 terminals 1 wire closes or opens to the switches body....which will be grounded at the engine when it is screwed in. __________________ Rich Biebel S/C 1479 Stock 147R Last edited by Rich Biebel; 10-05-2014 at 03:02 PM.