Re: [Amel Yacht Owners] Onan Generator

Craig Briggs

Hi again, Heinz,

I just stumbled across a technique to flash your generator that I had not seen before. Nor have I tried it but it sounds like fun and just might solve your problem..

Plug an electric drill into an outlet after you set all switches/breakers so the outlet would be energized if the generator were working. Start the generator (keep it running with the preheat switch or jumper the shut-down relay). With the drill switched to "forward", pull the trigger, which, of course, won't do anything because your Onan is not making electricity. Now, spin the drill backwards by hand, while holding the trigger on.  This will generate a small current which will "flash" the generator. If it works the drill will start to spin forwards, so be careful.

Let us know!
Craig SN68

---In amelyachtowners@..., <sangaris@...> wrote :

Hi Heinz,

It is very easy, but I would suggest you "google" it on a site in your native language. Basically it is putting 12v across the coils to excite the generating circuit. There are many "U" tube expanations, too.

Good luck with it,

---In amelyachtowners@..., <heinz@...> wrote :

Thanks fore the anther but how do I re-flash a generator?

Am 29.11.2018 um 10:41 schrieb sangaris@... [amelyachtowners] <amelyachtowners@...>:



I believe your Onan has a "No AC Output" shutdown switch that would shut it down as you describe. 
With any luck, you may simply have to re-flash the generator to solve the problem. 

If that doesn't work you'll want to check the circuitry on the generator for winding continuity, resistance through the brushes, etc. (I assume you have fixed the short circuit, of course, and checked breakers.)

Let us know what you find.
Cheers, Craig SN68

---In amelyachtowners@..., <mcerdos@...> wrote :



I think you are dealing with a couple of issues.


Since you had an electrical short did you check the master circuit breaker on the generator?


Is the fuel supply sufficient? Are you getting enough fuel from the electric pump? Is the fuel clean? The most common cause of a diesel engine shutting down once it has started is lack of fuel. Believe it or not, it is very hard to stop a running diesel engine.





With best regards,





Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Santa Marta, Colombia


From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Thursday, November 29, 2018 7:55 AM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Onan Generator



I would have yesterday with Onan generator switched on a short circuit in an electric line.
Then the generator went out.
The generator starts since then briefly, then goes out however immediately again.
Only if I increase the speed of the generator manually after the start, it remains on, but does not generate electricity.
Somebody knows advice.
I am grateful for each suggestion
Super Maramu 2000, 292 Panama

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