Bob, here is a pic of the isolator relay in an electrical compartment. You notice it says 'Diesel' even though I have a gasser. Don't know if it is original or has been replaced.
There are pictures of both gasser and diesel isolators in the owners manual, and the connections are different. The diesel has an additional connection for the genset, which the gasser one does not have.
To quote from the owners manual:
Automotive 12-volt system
The vehicle's alternator provides power to charge both the automotive 12-volt battery and the coach 'house' batteries. An isolator rely system prevents the RV battery from draining the automotive battery.
The automotive battery provides power to start and run the vehicle's ignitions system and various automotive lights and accessories.
The alternator charges the RV battery that, in turn, powers all the appliances and equipment in the 'house' portion of the vehicle that use 12-volts. These include the furnace blower, refrigerator, water heater ignition, and the water pump. The RV battery is charged through the power converter whenever the vehicle is using a shoreline connection or when a generator is used. The chassis battery is only charged when the vehicle is running. End quote.
The first paragraph,
The vehicle's alternator provides power to charge both the automotive 12-volt battery and the coach 'house' batteries. An isolator rely system prevents the RV battery from draining the automotive battery. tells me the 'house' batteries should have been fully charged from the ALTERNATOR after a 5 hour drive. Apparently, the isolator relay did not isolate the chassis battery after shutting off the vehicle.
Ron