If voltage is indicated, repair or replace harness lead 66 to the
APU wall-mounted receptacle IAW TM 9-2350-267-20. If no voltage
is indicated, troubleshoot the main power harness IAW TM 9-2350-
267-20 (Figure 37).
If main cargo compartment wiring harness (12330252) is defective,
notify Support Maintenance.
If voltage was indicated when testing terminal A, set
the MASTER switch to the OFF position.
Reconnect the main
harness connector to the APU wall-mounted receptacle and remove
the APU engine door panel. Test terminals N and P by placing the
multimeter red probe on terminals N and P and placing the black
probe on a good ground (Figure 38). Set the MASTER switch to the
ON position. If no voltage is indicated, lead N must be repaired
or replaced as outlined in TM 9-2350-267-20.
If you obtain a
voltage reading when testing terminals N and P, then Test 3 must
APU Wall-mounted Receptacle and Leads 49 and 66.
Since a voltage reading was obtained when testing
terminals N and P, place the multimeter red probe on terminal P
and the black probe to a good ground (Figure 39). If no voltage
is indicated, lead P must be repaired or replaced. If voltage is
indicated after testing terminal P, then proceed to Test 4 and
conduct a test on terminal 487.