Put a test light on that connector, to ground, and then step on the brakes and see if it lights. If so, it is the wire for the center high mounted brake light for a bed topper or cap such as a LEER.
Some GM products require plugging in at a multi wire connector for the high center brake light, others use a single wire like this.
Universal plug that matches the connector installed by LEER and others in the cap is a American Technology Components Inc. C90-907 kit which has inline fuses and wire for brake and dome.
Charles
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'03 Ram 2500 CTD, 5.9HO six speed PacBrake std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previously, 2008 Thor Freedom Spirit 180, SOLD! 2007 Winnebago View 23H Motorhome, SOLD!
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