there is nothing to those flapper valves, as then usual rust open, or fall off altogether.
The back pressure would build up on idle and kill the motor, but usually whistle as the exhaust finds a way out.
If you have something shorting out while your moving, you would smell it melting or burning, plus all your other electrical stuff would blink.
I re-read your first post, as it ran when your pushed in the circuit breaker, so still going with the hidden short of burned bundle of harness wires, you can seam to find.
Disconnect all, and try from there.
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