Wiring harness installation question

[theman]

Using the BA youtube vid as guide I installed the VPLAT0013ABP on my 13 LR4 today, but wound up with this 'extra' connector behind the taillight, and when I tested the hookup on a trailer whose owner said the lighting works, got nothing on the trailer. There's no other un-mated connector on either end of the harness or from the vehicle. Connector in question is the leftmost/6pin.

Thanks for any insight or help.

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