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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14988
Experience:  Certified on Onan and Generac generators
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I have a guardian 4390 15KW generator. The weekly exercise

Customer Question

I have a guardian 4390 15KW generator. The weekly exercise is not working and my battery dies every couple of weeks. I have already replaced the board and the voltage regulator. Any ideas what else it could be. I don't think the built in battery charger is working but this should not keep the weekly exercise from working?
JA: What's the make and model of the generator? And can you guesstimate how old it is?
Customer: Year 2006 Generac 4390 15KW
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: I think that is all I have now
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Small Engine Technician about your situation and then connect you two.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Hank F. replied 1 year ago.

If the battery keeps going dead, either the battery charger or relay is bad, or you have blown a fuse.

If the weekly exercise is not working, you need to try and reset it.

If it will not reset, the main control board is bad.