On my 2001 Mirada, the EMER START switch is a momentary switch (need to hold it down)
It energizes the isolator solenoid as long as the switch is held, tieing the house battery to the truck battery.
I plan on adding a relay and switch this spring that will tie the truck battery to the coach batter whenever Shore power is on . This will help keep the truck battery charged when we are plugged into shore power. I'll also add a switch on the instrument panel to enable/disable this function.
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