TM 10-3930-659-20 6-16. LEFT PANEL WIRING HARNESS MAINTENANCE (Con’t) 4. Connect two defroster blower diode connectors (22) to defroster blower diodes (21). 5. Connect two heater blower diode connectors (20) to heater blower diodes (15). 6. Install cover (19) on heater housing (16) with four washers (18) and screw (17). TA707757 6-69