jgmace wrote:
OK, I let it run for about an hour this afternoon. I tried the switch you mentioned, but no luck. Perhaps I didn't hold it down long enough. I'll try it again and hold the bypass switch down for a while before attempting to start the generator.
Let's back up a bit please.
Obviously your house batteries are NOT charging when they should be.
THAT is more likely the real problem instead of a parasitic drain (but it could be a combination of both).
There is a "battery solenoid" which is responsible for connecting the two batteries together when they should be; while the main engine is running and when you push the "emergency battery" switch.
You need a meter to do some voltage tests.......or you need to take it to a shop for testing and repair. IIRC the replacement of my battery solenoid cost me around $100 at a shop.