CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
B.O. DRIVE CONDITION--Continued
WARNING
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.
J
Reconnect main lighting and master relay wiring
harness to main lighting switch. Disconnect switch
panel to gage panel and miscellaneous switches
wiring harness from main switch panel. Place red
lead of multimeter on pin N of wire 10 and black lead
to ground. Turn MASTER switch on and check for
voltage. Turn MASTER switch OFF. If voltage is
present, repair/replace wire 10 of main lighting and
B.O. selector switch wiring harness (see paragraph
6-69). If voltage is not present, go to step K.
K
Reconnect
switch
panel
to
gage
panel
and
miscellaneous switches wiring harness to main
switch panel. Open air inlet doors (TM 9-2350-256-
10). 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).
2—
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