CHAPTER 6: MAINTENANCE OF ELECTRICAL SYSTEMS AND CIRCUITS
TM 9-2350-256-20
6-78 REPLACE/REPAIR APU WIRING HARNESS (11672417)
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 (3) (Appendix G, item 108)
Parts:
Equipment Condition:
Lockwasher (Appendix G, item 103)
APU access cover assembly removed (see
Lockwashers (4) (Appendix G, item 107)
paragraph 9-49)
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
APU engine disconnect bracket
421, 65, 487, 62,
66, 61, 478A, 65
2
Bulkhead to APU, master relay, and rigger's lights wiring
GND
harness
3
Diode assembly
S
4
Preheat solenoid
N
5
Fuel shutoff solenoid
421
6
Preheat solenoid
65
7
Preheat solenoid
487
8
APU generator
62
9
APU starter relay
66
10
APU generator
61
11
APU generator
478A
12
APU starter relay
65
13
APU generator
GND
6-208