I forgot to mention that the fact your gen won’t crank suggests another problem. Perhaps an open 100 amp breaker needs to be reset somewhere between your coach batteries and the gen starter solenoid.....or your coach batteries are not fully charged; loose connection somewhere etc. The reason I suggest this is that usually the gen starter and hydraulic motor/starter solenoid are fed off the coach batteries through a large amperage rated breaker and not through the coach battery latching relay (but I don't know your coach). So you may have a couple issues going on here. When the dust settles though, you will be an expert on your coach battery charging system.....a very useful knowledge to have.
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