2004 Cadillac Escalade Q&A

2004 Cadillac Escalade Question: what is the name of the part that the taillight harnesses plug into.

there is a small thin box mounted under the truck at the right rear quarter panel. all the tail light wiring harnesses plug into it, what is this part name or number. tail lights work good if headlights are off but with headlight on they stop working. tap on this box and they will come on. -
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