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Does The Aux Port Need To Get Connected For Reverse Lights When Upgrading From A 4 Flat

Question:

I have purchased this harness and a 4-7 way Curt #C57674 trailer connection. The 7-way has a yellow wire for auxillary or back-up lights. Since #TK47FR connects directly into the X5 tail light, will the trailer back-up lights activate without having to use the 7-way yellow wire?

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Expert Reply:

The black box, or converter, on the Tekonsha T-One Vehicle Wiring Harness # TK47FR will actually combine/delete certain functions for a 4 Flat harness as most smaller trailers will not have reverse lights. With that being said, if you wanted to get the reverse lights working, you will need to attach the auxiliary port of the # C57674 to the reverse lights.

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Lazer S

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