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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14489
Experience:  Certified on Onan and Generac generators
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ONAN 4KYFA26100K MODEL. Replaced starter, new battery (13.5v

Customer Question

ONAN 4KYFA26100K MODEL. Replaced starter, new battery (13.5v at solenoid), cleaned grounding cable at unit and frame, had generator running fine. after about a month, approximately 6 starts, a problem has returned. When we hit the start button the solenoid makes a loud buzzing noise and unit will not crank. If I hotwire the starter wire side of solenoid the engine turns over fine but will not start. Used a standard solenoid from NAPA to replace old one and it seemed to be working fine until now. Question: Is the solenoid for this unit something that must be replaced with a like kind? if so what kind is that? any other ideas about what might be the problem.
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Submitted: 9 months ago.
Category: Small Engine
Expert:  Hank F. replied 9 months ago.

The buzzing noise you hear is due to low battery voltage getting to the solenoid.

You stated that you have 13.5VDC at the battery. That tells me that you have your coach plugged in, and are reading converter voltage.

If you have a master battery switch, it must be turned on for the genset to start.

If you do not have a battery switch, or it is already on, you likely have a bad battery. Take it in and have it load tested. Do not rely on a voltmeter or battery charger to tell you if the batter is good or not. Even a bad battery can read fully charged with 12V, but not have enough ampacity to do any work.