I had the exact same this happening on my Challenger. I could never find why it did that, and finally just disconnected the positive lead off the house batteries and tripped the 100-amp circuit breaker to ensure no current flow. I suspected my convertor wasn't disconnecting by throwing the battery disconnect switch to store (vice use) like it should have.
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2018 Aria 3901 towing 2022 GMC Canyon CC
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