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Re: [GMCnet] OK, next Onan question [message #322984 is a reply to message #322983] Wed, 30 August 2017 10:16 Go to previous messageGo to previous message
Emery Stora is currently offline  Emery Stora   United States
Messages: 959
Registered: January 2011
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Senior Member
There is a possibility that its a bad breaker on the top of the Onan or perhaps a bad bridge rectifier.

First make sure that the cord from the Onan is plugged into the receptacle..

Take the cover off the breaker box at the top of the Onan.
Use a voltmeter (VOM). Start the Onan and check the AC voltage from the left side of the breaker to ground.
If there is no voltage there its probably the bridge rectifier.
If there is 120 volts there then check the right side of the breaker. If there is voltage there then the problem is in the wires going to your inside breaker box or a bad connection in the box or a bad breaker in that box.
If there is no voltage there reset the Onan breaker. If still no voltage then that breaker is bad.

Let us know what you find and we’ll offer more suggestions.
connection
Emery Stora
77 Kingsley
Frederick, CO

> On Aug 30, 2017, at 9:00 AM, james Ernst wrote:
>
> Good morning all,
> If I may,I would like to ask an Onan on this thread. I fired up the
> Onan and started one of the A/C units all is good running fine. About 5
> minutes later started the 2nd unit everything is purring right along as it
> should.
>
> I left and went to pick up grand kids from school and another errand, gone
> about an hour total. Got home Onan running fine. I thought man it's going
> to me nice and cool in here. Nope it was hot and no A/C unit was running.
> Ah s***t I said. Turns out no 120V at all. Checked breaker box etc.
> Nada. Looked at reset button the Onan, ok. Got out service manual, looked
> at possible causes. Where do I start first with this now?
>
> Big thanks in advance,
>
> Jim Ernst
> 77 Palm Beach
> Columbus, NE
> Currently on location
> In Colorado Springs area.
>
> On Aug 30, 2017 1:34 AM, "Ken Burton" wrote:
>
> I am still working on this generator from hell. I thought and still think
> that I still have all of the wiring corrected. Now I am fighting a blown 5
> amp fuse after starting. It does it almost every time. I finally
> installed a temporary circuit breaker to keep from going through fuses. I
> think I
> have traced it down to the fuel pump. A Fluke amp probe show a stead 3.1
> amps going to the board with an occasional very brief jump to slightly over
> 5 amps. I will try a replacement aviation Facet or Bendix fuel pump
> tomorrow. If it were voltage spikes I could see it on an oscilloscope but I
> do
> not have am amp probe for it.
>
> The second bug is still the up to speed circuit. I had it working for a
> while and not it start and stops again. I finally checked the output of the
> alternator and it is a steady 24 VAC. It should be 28 to 30 or 31.
> Tomorrow I'll probably remove the flywheel and inspect the coils and inside
> flywheel for dirt and rust. I can see no way to bring up the voltage other
> than that. It reads 24 VAC (NOT 28) when plugged into the board or
> disconnected from the board.
>
> My final shot might be to jumper out the resistor in series wit K2. I do
> not remember the value of that item on a dinosaur board but I though George
> Z's resistor read something like 22 or 44 ohms. On the genuine Onan board
> that resistor is 200 ohms.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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