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Re: [GMCnet] OK, next Onan question [message #322983 is a reply to message #322725] Wed, 30 August 2017 10:00 Go to previous messageGo to previous message
james Ernst is currently offline  james Ernst   United States
Messages: 79
Registered: December 2013
Location: Lincoln, NE
Karma:
Member
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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