Onan QD 7500 no power to start switch

Didn’t see a separate section for generator issues, maybe someone here has more experience.


7.5HDKAT - 41934R

Has 4000 hours on it.

Changed oil and filter on it last month, then hadn’t used it since. Went to start it using the Command 30 remote - no start, no red light on switch when pushed.

Go to unit - no red light when switch pushed to prime or start. No fuel pump clicking - nothing.

3 DC fuses under switch panel good, and 13V to either sides. AC breaker on. Pulled rocker switch and tried another. Same result.

13 V to starter solenoid. All good.

Looking at the block that connects to the back of the rocker switch, it’s a block of 8, of which 5 have pins in them.

Top left and Top Right are ground. Next 3 down on the right are, 10.2V - GROUND - 10.2V.

I’m wondering if there’s a protection circuit that’s grounding one of these pins - like a low oil pressure switch.

Like I say - no red light at switch,

I replaced the high temp coolant sensor a couple of months back, as it would intermittently shut down. That fixed that problem, and I ran it 100 or so hours afterwards.

Any help would be greatly appreciated.

 

Oh yeah. Been through all this and some. And thanks for the response, by the way - I even joined an RV forum and posted this question - zero help.

FOUND THE PROBLEM!




And there’s the solution!!!

 

More details later. But it’s a pricey convenience.

 

Shot you a PM.

 

A1C main board. $1600+