5-8. PDU Wiring Harness Repair. A defective wiring harness in the PDU can be repaired by replacing
connectors or terminals, as applicable. Refer to paragraph 5-5 for wiring harness repair procedures.
5-9. PDU Contactor Testing and Replacement. (See figures 5-6 and 5-7 ) The PDU has two contactors.
Testing and replacement procedures are the same for both, except where noted.
Release cover latch and open PDU cover.
Screws, washers and covers are part of contactor and must remain with contactor
Remove four screws (1, figure 5-6) and four washers (2) and take two contactor covers (3) off
Disconnect connector P8 or P9 (5) from connector J8 or J9 (6) on contactor (4), as applicable.
Tag electrical leads (7) connected to contactor (4). Remove six nuts (8), six lockwashers (9)
and six flat washers (10) and remove electrical leads from contactor.
Remove four self-locking nuts (11) and four flat washers (12) and lift contactor (4) out of PDU
Make sure power source used for testing is turned off.
Do not exceed voltage required for test. Excessively high voltage may
damage power source or contactor.
Connect 2 amp, 28 VDC power source positive (+) lead to pin A of J8 or J9, as applicable.
Connect power source negative (-) lead to pin B of J8 or J9.
Hazardous voltages are present when using power source. Do not touch
circuitry or metal on power source or leads on multimeter while power is on.
Serious Injury or death by electrocution can result.
Turn power source on.
Set multimeter controls for continuity testing and check for continuity between terminal lugs Al
and A2, B1 and B2, and C1 and C2, and between pin G and pin H of J8 or J9.