hi,
as far as what else is on the breaker, the answer is who knows....everyone is slightly different.
before i tore into wiring, i would absolutely take everything out of the circuit. the blower and the compressor. to be sure.
for where it goes, when i had all my insides out of my coach, the romex wire went basically two places. it either went up in the wire chase on the top right and left of the coach or went down through the floor and ran along the top of the bottom bays. there may be more somewhere too.
i would check for shorts by disconnecting at the breaker and use a meter.
just eliminate one thing at a time. you will find it.
have fun.
tom
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