If you have a 7-Way and junction box setup on your the trailer your easiest route will be to just replace the junction box with something like the Epicord 7-Way # 277-000141. This harness features a 7-Way molded plug and pre-wired junction box with terminals so that you can simply make connections to what remains of your trailer wiring after removing the connector.
I have attached an installation video so you can see exactly how everything hooks up. The wire color/functions for the harness... view full answer...
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