TM 9-2350-256-20 CHAPTER 6: MAINTENANCE OF ELECTRICAL SYSTEMS AND CIRCUITS 6-75 REPLACE/REPAIR BULKHEAD TO AUXILIARY POWER UNIT (APU), MASTER RELAY, AND RIGGER'S LIGHTS WIRING HARNESS (DUAL VOLTAGE) (1167241 2)-Continued 12  Connect two connectors (1 and 14) to bulkhead disconnect (20). 13  Install 20 clamps (17) using new lockwasher (19) and screw (18) for each. NOTE Follow-on maintenance:   Install air inlet doors (see paragraph 9-56) 6-76 REPLACE/REPAIR BULKHEAD TO APU, MASTER RELAY, AND RIGGER'S LIGHTS WIRING HARNESS (SINGLE VOLTAGE) (11671324) THIS TASK COVERS a.  Removal b.  Disassembly c.  Assembly d.  Installation INITIAL SET-UP Tools: Parts-Continued: Tool kit, general mechanic's (Appendix C, item 53)   Lockwashers (4) (Appendix G, item 105)   Lockwashers (10) (Appendix G, item 116) Parts: Lockwashers (4) (Appendix G, item 103) Equipment Condition: Air inlet grilles removed (see paragraph 9-56) WARNING Be certain MASTER switch is OFF when working on electrical systems to avoid electrical shock and bums. Connector No. Electrical Lead To: Wire No. 1 Bulkhead disconnect 420, 420A, 493, 421, 65, 487, 65, 514, 17, 26 2 APU engine disconnect 420, 420A, 493 3 APU engine disconnect 421, 65, 487, 66, 65, 62, 478A, 61 4 Hydraulic pressure switch J 5 Hydraulic pressure switch H 6 Switching relay box H, 61, 478A 7 Main engine generator relay 62 8 Rigger's right service light 514 9 Rigger's left service light 17 10 Bulkhead to main engine wiring harness and starter relay 26 wiring harness 11 Bulkhead to main engine wiring harness and starter relay J wiring harness 6-200