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Our Onans of that era had a control box with a printed circuit board about
8" x 6" that did the AC voltage regulation. One of the problems is they are
subject to considerable vibration being mounted on the genset so in many
installations they have been moved off and mounted adjacent to improve
reliability so it may not be "ON" the genset.
I repaired ours a number of times to keep them running. There are
adjustments on the board to (re)set the voltage.
Andina Foster,
> Hello all,
> Quickie question for any Onan gurus. We have a MDJB 6KW Onan that runs
like
> a champ (last year it wouldn't hold a load and volts would drop. Well,
> rebuilt the lift pump and all is well again. I knew the diaphragm was bad
> and changed the oil every 20 hrs until I could change the diaphragm out.
> Well..... what a difference. Obviously the diaphragm was introducing
air
> into the system, now no smoke, governor reacts immediately)
> I just tried out our new Kill A Watt (recommended by the list-thank you).
> We now have 125 volts running at 50 hertz. Volts and hertz remain
constant
> when a load is applied. I can increase the rpm's and increase hertz, but
> the voltage starts increasing also. I'm dumbfounded. The manual says
> nothing about this. The only type of 'regulator I can find in the
schematic
> is for the battery charging system. Am I missing something??? Anyone
have
> experience in what is happening? The gen appears to have been the boat
> since new ('69) so I don't think (hope) it's a European version????
> Any insight is most welcome!
> Chris
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