If it's not addressed, it will melt again. Perhaps the connector's internal surface got corroded or the pin that it attached to got corroded - or the motor is failing an drawing too much power? I'm guessing environment that it lives in.
My "professionally installed" dishwasher recently melted one of the "wire-nut" connectors and some adjacent wire inside the connection box; it lives in a damp environment and consumes a lot of power. I redid the wiring and soldered the connectors before putting a wire-nut over them, will probably last longer than the dishwasher now.
Standard color codes for crimp-on connectors:
Red- 22 to 16 gauge
Blue- 16-14 gauge
Yellow- 12-10 gauge
So the one that you thought that you were going to get (yellow connector) is 12 - 10 gauge, fairly fat wire, not the dinky things you were sent.
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