CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
2-19 ELECTRICAL TROUBLESHOOTING-Continued
APU ENGINE OIL PRESSURE GAGE CIRCUIT-Continued
Remove all jewelry such as rings, dog tags,
bracelets, etc. If jewelry contacts a metal
surface a direct short may result in instant
heating of tools, damage to equipment, and
injury or death to personnel.
C Reconnect wire 10-419 to Y-connector of switch panel,
radio, and bilge pump to bulkhead wiring harness to main
switch panel. Install main switch panel (5), flat washer
(4), ground wire (3), three lockwashers (2), and three
screws (1) to mounting bracket. Disconnect wire 48 pin A
from bulkhead to master relay wiring harness. Place red
multimeter lead in socket and black lead to ground. Turn
MASTER switch on and check for voltage. If voltage is
present, repair/replace switch panel, radio, and bilge
pump to bulkhead wiring harness (see paragraph 6-53).
If voltage is not present, troubleshoot master relay circuit
(see paragraph 2-19, master relay fails to operate).