A track assembly for a sliding vehicle door, which includes a wire track extending between a track mount assembly attached to the sliding vehicle door and a body mount component. The wire track comprises a plurality of interconnected links allowing the wire track to articulate in a wire track articulation plane between door closed and door open positions. A wiring harness extends through the wire track. An elastomeric grommet extends from the track mount assembly and surrounds the wiring harness while permitting the wiring harness to twist and bend inside the grommet as the wire track articulates. A roller track is mounted to a vehicle body structure. The body mount component is mounted below the roller track such that the wire track articulation plane is disposed below a lower wall of the roller track.