Agree, MJCAT.
Supplementing my comment above, some years ago I was in discussions with a manufacturer of marine air conditioning units. They advised me that the principal cause of problems was that crimp connectors would overheat & fail. I have encountered that issue on marine a/c units, usually when a unit has been operating continuously for several days at about 17 amps on a12-gauge circuit. On these units, I always replace crimped splices in a/c unit with an Ideal product that uses a metal ring with a set screw, over which a cap is screwed