SECTION V: TROUBLESHOOTING
Remove all jewelry such as rings, dog
tags, bracelets, etc. If jewelry contacts a
metal surface a direct short may result in
Reconnect bulkhead to APU, master relay, and rigger's
lights wiring harness to bulkhead disconnect. Open
center-front air inlet doors (TM 9-2350-256-10).
Disconnect bulkhead to APU, master relay, and rigger's
lights wiring harness from APU engine disconnect.
Place red lead of multimeter on pin B of wire 420A and
black lead to ground. Turn MASTER and APU FUEL
SHUTOFF switches ON and check for voltage. Turn
MASTER and APU FUEL SHUTOFF switches OFF. If
voltage is present, notify Direct Support Maintenance.
If voltage is not present, repair/replace wire 420A of
bulkhead to APU, master relay, and rigger's lights
wiring harness (see paragraph 6-75 for dual voltage; 6-
76 for single voltage).