Maybe the cord has pulled away from the plug ( not uncommon, twice for me) exposing wiring, and he thinks wrapping in tinfoil protects from moisture?? Electrical tape would be a better interim solution.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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