dougrainer statements are correct. Both solenoids require momentary power to open AND close.
The coach disconnect indicator light can be misleading. If the charger/converter is active the light will not go out even though the batteries are be disconnected. Same for the chassis as dougrainer described.
The cross connect, aka Aux Start, solenoid is controlled automatically by the BCC for charging of both battery banks or momentarily cross connecting with the Aux Start switch.
The cross connect will activate if either battery bank voltage goes above 13.3 volts for 14 seconds and will open if the chassis power drops below 12 volts or the coach dropping to 12.8 volts for 4 seconds.
If the chassis solenoid is not closing you would not be able to start the engine. Discovered myself the hard way. For cross charging (chassis to coach or the reverse) all three solenoids must be closed.
My recommendation, check the fuses at the charger/converter. Easy to blow them when changing batteries even if you connect the leads to the battery correctly. Another way to check is with the coach plugged into shore power or with the generator running AND with the engine off hit the switch to disconnect the coach batteries. If coach goes dark the fuses on the output of the converter/charger are blown.
Here's a copy of
Intellitec Mini Gas BCC service manual and a
Trouble Shooting guide. The trouble shooting guide also lists the various changes for the revisions to the BCC.
