Update.
Thank you for your replies.
We found that the problem was in the house, the connector for the wires going to the 30V plug was bad and caused a loose connection which burnt the wires. Fortunately for us the wires were in a junction box so the arcing was contained and there was no threat to the house.
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Jeff Frankel
2013 Cougar 297RKWS
2019 Ram 2500 6.4l Diesel
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