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How did you check the voltage? Surface voltage like you can measure with a multimeter won't give you the real condition of the batteries. You need to have them load tested and checked for shorted cells. Most places that sell batteries have a tester for that. If these are over 3 years old, there is a good chance they need replacing. Don't forget to clean the ground lead to the chassis. That can be a source of problems with low voltage. Hope that proves helpful here. Please get back to me if we need to do more work on this as all follow us are included in our fee.
I would do that then........and one thing we do in the shop when we suspect the battery is to hook up an external source OR have the battery getting some additional charging to be sure we eliminate that as a cause of the problem. It can be a start solenoid that has dirty connections OR is failing due to burned contacts internally. Checking for the incoming DC voltage on BOTH sides of that can be an indication.
10-4...........I will make a phone offer for you and let me know when is a good time to chat.
Our Onan tech on site says there is no "Low Voltage" code on that set............are you sure you read it correctly?
That fault code is actually a "Low Cranking Speed" fault...........and that can be a result of the battery issue I gave you earlier. Did you try another outside power source for the starting? Or have the coach plugged into shore power so the battery can be charged (if this is the house battery). Try that and get back to me.
O.K...........I will opt out of this and hopefully, one of our techs who is great with Onan sets can jump in and assist you. He is pretty busy, so be patient. Thanks!
I can provide you with a service manual if that would help you. I will need your full model number however.
Other than providing a service manual I can not be of any more help on this issue. My apologies.
Hello, my name is ***** ***** I am going to assist you with this.
I am actually a cerified Onan technician.
The first thing I need you to do is to connect an AC voltmeter to the output leads of the genset.
Press and hold the start button for a few seconds to keep the engine running.
What voltage reading do you get?