How to convert 4-way flat connection to 7-way round connection, and add trailer brake wiring.
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How to convert a 4 way flat trailer plug to a 7 way round trailer plug. Trailer Wire repair.
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Testing!
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How to Read Electrical Schematics (Crash Course) | TPC Training
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Automotive Wiring Connectors 101: Tech Tip Tuesday
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Trailer 7way Junction box explained
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