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In 2013 (I think) Thor had a recall on many coaches that used the RV Custom Products BCC (battery control cabinet) which basically disconnected the chassis ignition switched connection on the BCC, and moved it to the BCC terminal that directly connects to the chassis battery. The reason for this change was to prevent the potential for the chassis disconnect latching relay failing open, which would kill the engine, lights, power steering etc., at any time (stopped, under way, night ...). So JZAdventure's relay failure is likely the chassis battery latching relay that failed prior to the recall being completed I suspect. After the recall the ignition cable is hard wired to the chassis battery and not dependent on the chassis battery latching relay in the BCC to complete the circuit. It would still be important to fix the chassis latching relay in the BCC though as it controls other loads (like steps etc).
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