It sounds like you're needing to combine a standard 7-Way lead, like the Hopkins 7-Way RV Style Connector with Molded Cable # HM20041, with a 7-Way round pin connector like the Pollak # PK11700. You will be able to connect the open end of the etrailer 7-Way wiring directly to the Pollak. Just keep in mind that for the standard 7-Way blade the turn and brake signals are combined while the 7-Pole connectors usually have those split into their own circuits.
This is a pretty unusual setup... view full answer...
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