Check the wire that runs from the turn knob and track it to the burner starter. I've had 4 different trailers, and each one, those black wires would crack. Once it cracked, the spark was still sparking, but it was arching ... um ... not at the burner. It was arching wherever the crack in the coating of the wire occured.
Take a careful look at the wire. If you find a crack in the wire coating, wrap it with electrical tape. Or better yet, replace the wire.
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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