<strong>Yahoo Message Number: 100631</strong>Jim,<br/><br/>I've got a Heart Interface, Model 1800-12, that is giving an error message. When I have the Master Battery switch - OFF, it looks like the inverter is still on and drains the house batteries. I have to climb into the forward passenger bay to actually turn the inverter off. Shouldn't it turn off when the Master Battery Switch is turned...