I had a similar problem last year and finally discovered the problem. I wasn't smart enough to realize this only happened when the toad was connected but that was the source of the problem. There was a hot 12 volt feedback through the toad light cable to the ignition module in the coach that kept the engine running when the key was turned off. I disconnected the wire and taped it off so no more problem.
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Bob Retired Army Traveling alone now, had to put Charlie the Beagle down :(.
2008 Camelot 40 PDQ 4 slides ISL400 towing a 2020 1500 GMC Sierra Denali 4x4 Crewcab
Western MT in summer, AZ, NV in winter
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