The brake and turn signal circuits are combined in standard trailer wiring applications therefore, I think there might be an issue with how the tow vehicle is wired. If the tow vehicle uses separate brake and turn signal circuits then you will need to combine them with the Roadmaster Brite-Lite Wiring Converter part # RM-732 which can then be wired to the 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket part # HM40975-11998. If you can't access the stop light circuit on your... view full answer...
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