I’m not sure I understand, but if your monitor says 13.6v on the coach battery and it is hooked directly to the battery, then the coach battery should charge. If it does and the chassis battery stills shows no charge, You might try pushing the emergency start button and leaving it In for a while to see if juice will flow from the coach battery and shore power thru the emergency start to the chassis battery. If it does you could tape the button down and charge up your chassis battery that way enough to start the engine. It seems that the BIRD or BCC is not opening the solenoid to connect the two systems. I don’t know if that would work, but it might be worth a try.
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