A power drive unit, comprising: a drive roller; a drive motor configured to rotate the drive roller; and a harness system configured to provide power to the drive motor, the harness system comprising: a flexible harness; an electrical cable having a first end and a second end; a plurality of cover members positioned along a length of the electrical cable; a spring member having a clip portion extending through the plurality of cover members along the length of the electrical cable; a bracket configured to house a portion of the electrical cable proximate the second end of the electrical cable, the bracket including a first bracket-end having a slot configured to receive the clip portion of the spring member, the clip portion of the spring member bending backward on itself and configured to be received within the slot, the bracket further including a top plate and a bottom plate, each having a guide slot configured to receive a pin secured to one of the plurality of cover members proximate the guide slot, the bracket further including a hollow interior, enclosed by the top plate and the bottom plate, leaving an opening to thread the flexible harness therethrough, the flexible harness including the electrical cable, surrounded by the plurality of cover members, and the spring member extending through the plurality of cover members; the harness system further comprising a first electrical plug positioned at the first end of the electrical cable and a second electrical plug positioned at the second end of the electrical cable. a drive roller; a drive motor configured to rotate the drive roller; and a harness system configured to provide power to the drive motor, the harness system comprising: a flexible harness; an electrical cable having a first end and a second end; a plurality of cover members positioned along a length of the electrical cable; a spring member having a clip portion extending through the plurality of cover members along the length of the electrical cable; a bracket configured to house a portion of the electrical cable proximate the second end of the electrical cable, the bracket including a first bracket-end having a slot configured to receive the clip portion of the spring member, the clip portion of the spring member bending backward on itself and configured to be received within the slot, the bracket further including a top plate and a bottom plate, each having a guide slot configured to receive a pin secured to one of the plurality of cover members proximate the guide slot, the bracket further including a hollow interior, enclosed by the top plate and the bottom plate, leaving an opening to thread the flexible harness therethrough, the flexible harness including the electrical cable, surrounded by the plurality of cover members, and the spring member extending through the plurality of cover members; the harness system further comprising a first electrical plug positioned at the first end of the electrical cable and a second electrical plug positioned at the second end of the electrical cable. a flexible harness; an electrical cable having a first end and a second end; a plurality of cover members positioned along a length of the electrical cable; a spring member having a clip portion extending through the plurality of cover members along the length of the electrical cable; a bracket configured to house a portion of the electrical cable proximate the second end of the electrical cable, the bracket including a first bracket-end having a slot configured to receive the clip portion of the spring member, the clip portion of the spring member bending backward on itself and configured to be received within the slot, the bracket further including a top plate and a bottom plate, each having a guide slot configured to receive a pin secured to one of the plurality of cover members proximate the guide slot, the bracket further including a hollow interior, enclosed by the top plate and the bottom plate, leaving an opening to thread the flexible harness therethrough, the flexible harness including the electrical cable, surrounded by the plurality of cover members, and the spring member extending through the plurality of cover members; the harness system further comprising a first electrical plug positioned at the first end of the electrical cable and a second electrical plug positioned at the second end of the electrical cable.