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I had this happen as well a couple of years ago. It was a bad contact inside the switch and the popping noise was the contacts starting to burn. I got the thing stripped down and cleaned and the contacts sanded and it worked great afterwards.
I had this happen as well a couple of years ago. It was a bad contact inside the switch and the popping noise was the contacts starting to burn. I got the thing stripped down and cleaned and the contacts sanded and it worked great afterwards.