skydivemark,
I'm sorry to say I don't have any specific ideas.
The store/use relay not engaging is the most concerning issue in my thinking.... seems like it is yours too. The thing to chase first.
random thoughts
1) it seems like a dead battery in that everything is dead...no clicks. sounds like you've verified voltage at the battery at least. Have you verified voltage at the relay itself?
2) the next thought is the fuses at the relay. Mine has a couple of 5 amp fuses...those inline fuse holder things that hold a flat automotive type fuse. They seem to be tapping the power form the battery side post and the other from the other side.... I'm guessing at least one of them is what is sending power back to the switch by the door, to pull in the relay...I think both do. Maybe a blown fuse there? pages 2 and 3 of my schematic set. Do you have schematics? Mine are very sadly done, and prob different than your newer rig, but I'd be happy to send them to you...maybe they could help till you get the current ones for your rig. Let me know.
3) Next thought, loops me back around to what others have pointed to. There seems to be a breaker between the battery and the relay. If you have voltage at the relay then this should be good I think... but if you don't then that is what I would look for. I have not had to locate where mine is yet.
re. the generator...I think what you are saying is that the last time you cranked the starter 'without actually starting', the little red light stayed on. Turned off after pressing stop a few times.
Mine does that all the time.
seems to be various faults that 'lock it out'
it won't start or even try to run the starter while it's lit.
and the faults are 'cleared' by pressing stop till the light turns off. Then it will crank again.
My genny seems to be the most ornery and temperamental thing. I can't believe how sorry the thing is. I can see no reason why an engine like that wouldn't be as reliable as my chevy pick-up's is today, after almost 200,000 miles!
& It seems like mine is not unique. Seems like all the onans do it. The bigger diesel rigs seem to be much better from what I can tell reading the forums, but they're not without issues.
As you might know, I did some work to improve the cooling air flow. Also re-routed the fuel line and insulated it. It does seem to handle the heat noticeably better now.
It always takes more time than I think it should to get it primed and started...but once it goes the genny will run fine..... many times over many days....then without warning it'll just die. or sometimes it will stutter and stumble then die. other times it will stutter and stumble but keep running.
If i crank it a little too long...like maybe i didn't prime it enough, it will fault and "lock out" and won't crank again till I clear it by pressing stop a few times.
after that, sometimes I can get it running again and it just runs smooth. Other times I can get it to start and it just spits and sputters a bit then dies again...and again....
then the next time I try it....maybe the next day...it fires up and runs like it ought to without problem.
and it's not always doing this stuff when it's hot. Seems much more random and not related to weather and temperature
oh, & I have yet to find any benefit in reading the fault codes. It always seems to be some generic code.... to bring it in for service.
which is what I would love to do
....if I had time and a convenient place to take it.
but I have little confidence that they would make it any better anyway.
Just last week I was thinking of trying to make a plan to get it to an onan shop....but other times when it's come to that, the thing will run like a honda for days and I figure why bother?
anyway, good luck with yours! hopefully when you get the relay sorted the genny will be fine.
