You should also check the power supply wiring to the unit, as undersized wire could have contributed to the problem.
the wire on the uint itself, both to and from the cap, and to and from the C connection are very small wires. But inside the boat they are all 12 or 14 gauge. The issue was shore power, I had about 3 extention cords from the yacht to the plug. It burned the plug out too.
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