Comments: JLG G5-18A and 2505 models prior to S/N 0160042155 - If machine heater harness has a square connector at heater unit, jumper harness p/n 1001110377 is required also. If machine heater harness has a flat connector at heater unit, nothing additional is needed. Skytrak models prior to S/N 0160045250 - If machine heater harness has a square connector at heater unit, jumper harness p/n 1001110377 is required also. If machine heater harness has a flat connector at heater unit, nothing additional is needed. All other applications - Nothing additional needed.