Re: ONAN Generator not starting
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I believe that you are describing a situation where the Onan attempts to turnover, but it seems as though you are trying to start it with a weak or dead battery. I recently reviewed this situation with a client. I think this may help, if not solve the issue:
On all of the SMs and 54s that I have checked, the length of battery cable to the Onan is almost twice as long as the cable to main engine, but the size of the wire to the Onan is the same size (gauge) as the main engine. Logic tells me that either the main engine battery cable is oversized, or the Onan cable is undersized.
The Onan has starter battery connection terminals on the left-side-facing and near the rear of the Onan. The Onan has a hidden-from-view cables from the battery connection terminals mentioned above to the battery side of the negative solenoid and positive starter solenoid. This is Onan Part Number: 338-3577-01 Battery Harness.
I believe, that in at least some cases, this Onan Part Number 338-3577-01 Battery Harness is the cause of a loss of amperage throughput to the starter. I have advised a few clients when experiencing this issue to:
If all of the above is checked/completed and the Onan is still not starting, You should shut off Battery Main Switches to perform the following:
Alan, I know that you are competent. Please let me know if this works for you and I would appreciate photos. I have tried to find a drawing of the suspected connection wire, but have not. There is limited evidence that points to this jumper wire being a solution, but I am not positive.
CW Bill Rouse
Yacht School - Supporting Amel Owners
720 Winnie St
Galveston Island, TX 77550
On Sat, Aug 10, 2019, 7:57 PM Alan Leslie <s.v.elyse@...> wrote: