Look for the brown wire for your park lights underneath the rear bumper. It's in one of 4 connectors bunched together, should be on the pass side of the bunch. Use a weather tight connector(not a scotch lock). Ground side to any metal clean surface.
The bolt holes for the carrier won't exactly line up on a 2003 truck--be careful when you're drilling so you don't hit any harnesses behind the bumper.
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