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Do you have the Owner's Manual for this? When you say "House batteries about 3/4 full" what does that mean here?
owners manual is no help, no information. House batteries are charged to about 3/4 capacity
I suspect that this is a battery issue and that would be the first thing to check. Be sure they are full of water and if they are over 3 years old there is a good chance they need replacement. They may have a damaged cell. Check the cable connections as well. Batteries that are failing and dirty cables account for about 70% of the problems we see here on site for electrical issues. Don't neglect the ground cable to the chassis.....either from the genset or the batteries. Then get back to me if we need to go further into this as all follow ups are included.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?