Originally Posted by LkptRvPilot
How do you know that the coach is being connected to the chassis battery?
I noticed the battery monitor for the coach battery showed a voltage reduction when I switched the ignition switch to the "Accessory" position, and it showed it was supplying several amps of current (probably charging the engine battery, which is 1 volt lower than the coach battery, due to the solar panel charging on the coach battery).
After reading your comment, I put a meter on the isolator relay coils. The coil is definitely powered on when the key is in the Accessory. The power assist button to help start the engine does seem to work properly for that function.
So, it appears Jayco intended this to happen, but I don't know why. Perhaps it was to protect the engine battery from being discharged if someone wanted to listen to the radio while the engine was off? Or maybe give you an easy way to charge the engine battery when you sit for weeks at a campground or boondocking?