Your aux power is feeding back by way of the last plug on the towed. You can disconnect that wire at the towed end, this way no needed changes on your coach.
I would in the future, change over to the 7way circuit on the coach, makes it easier and more straight forward for those time when you need it.
Trying to send you the diagram, not working for us
DTW
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Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP
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