BFL13, There are two disconnect switches at the doorway, one for the house batteries and one for the motor battery. Both have an indicator light to show the batteries are connected. When I disconnect the motor battery the light goes out, when I disconnect the house batteries the light stays on. I will look for the solenoid to see if it has failed "open". There is also a device (black box about 3 inches square) in the positive lead to the house battery. no reset buttons, no way to open it, a current rating of 85 amps. I checked both sides (in lead, out lead) for voltage, both show 0 volts.