Tropi-cal Coach Battery Charging Problems

I watered the batteries during my pre-travel maintenance. Batteries are about 4 years old. My alternator is working fine 13.6/8 VDC during charge and it recharges the chassis batteries fine but not the house batteries. All VAC systems worked fine for 400 miles on first day until we parked at the lodge. Ran both roof A/C, refrigerator and water heater on generator. I'm getting a new set of tires on Monday and then will stop at an RV park and get shore power. Until then I have no charging source to restore house battery voltage. I thought that was the way the boost switch functioned but was hoping it also worked in reverse. I didn't realize my generator started from the house batteries not the chassis. Still plenty to learn after 15 seasons and 154k miles.

Thanks for inputs.