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You sure can't start the genset with only 8.7 volts. Do you only have one chassis battery? These are usually set up to have at least four 6 VDC batteries in a series/parallel connection. Or at the least two larger 12 VDC batteries in parallel. Are you plugged into shore power or do you have that capability? And I will make the phone chat option available for you.
Sorry, I read that wrong..............happens when you start here at 5:00 a.m. Even new batteries fail on a regular basis. That battery should be load tested to see if it has a cell that is shorting out. That would draw down the voltage and cause it to be rendered pretty much useless. Don't you have an "Aux Start" button on there for allowing the coach batteries to aid in starting? That is pretty common on most all Class A coaches.
Then there is another issue with the coach starting............those batteries should have been more than enough to start the coach. Was the genset running when you tried this? That would have added some extra amps to them. Have you had any trouble with the inverter/charger lately?
I think you will have to call in a mobile tech to come out to your location and give you a hand with this. Too many potential issues on this which makes using this format difficult.
Did you change your mind about the phone chat?
Good idea............but, please let me know how this turns out.
You are most welcome!
It will close out when you give me a rating for my help on this question. You can still come back to it again, if needed later if you Bookmark it. Thanks for letting me know.......and hit the disconnect switch so the chassis battery can't drain. Be safe!
You can just leave it go........