your signal harness is grounding out.
the smoking is the contacts buring to a crisp and melting the plastic.
old trailer wiring , hack job behind left rear tail light lens , 2 screws , pull unit and look.
is tail, turn and brake fuses the correct size and not over size.
upping the amps on fuses , to stop it from popping, then burns up a $200 combo switch.
answer. overload.
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