There is a good reason wire nuts are verboten on boats...
This is one of those reason. The wire jackets entering this wing nut are both MELTED from high resistance...
Wire nuts on boats = M-I-C-K-E-Y M-O-U-S-E, come on sing along,,,,,,,,,,,
Of course we can't forget the sight for sore eyes in the back ground. Four 1GA battery cables were tied together with electrical tape and a 10X24 machine screw with no locking washer. You guessed it, they were also loose....