A system and method for connecting a high voltage wiring harness assembly to a vehicle. The system includes a tubing configured to provide an enclosure for the high voltage wiring harness assembly. The material used to form the tubing includes polytetrafluoroethylene to protect the high voltage wiring harness assembly from abrasion and to insulate the high voltage wiring harness assembly from substantial temperature fluctuations. The system may include an adapter plate configured to provide a mechanical and electrical grounding connection to the vehicle. The system may include a coupling assembly configured to couple the tubing and the adapter plate. The coupling provides a water tight seal between the tubing and the adapter plate. The high voltage wiring harness assembly includes a grounding braid. The coupling assembly is further configured to couple the grounding braid to the adapter plate for completing an electrical circuit between the grounding braid and the vehicle.