This sounds like you have a direct short to ground in the system. Disconnect the end of the heater coil furthest from the burnt connector. Test at the point where the connector is burning to ground. You should not have any continuity with the unit off. If you have continuity start at the furthest connection in the circuit and remove it. Contiunue till there is no continuity. This will be the point of thr direct short. Replace the bad part, and you should be good to go.
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