While we do carry a Pollak Trailer Connector Adapter # HM47425 which will adapt from a 7-pin on your semi to a 7-blade it will not work properly since the brake lights are separate from turn signals on your 7-pin. Instead you will need to create your own adapter using the following components.
7-Pole, Round Pin, Trailer Wiring Connector # PK11700
7-Pole, RV Blade-Style Trailer Socket # PK12-707E
Tail Light Converter # HM48847
You will need some wiring for connecting the other circuits... view full answer...
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