CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
B.O. SERVICE CONDITION (B.O. STOPLIGHT)-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 wire 75/16 to stoplight switch. Disconnect
wire 75 from stoplight switch. Place red lead of
multimeter on wire 75 of stoplight switch and black
lead to ground. Turn MASTER switch on, UNLOCK
and move main lighting switch to B.O. MARKER
position, press stoplight switch, and check for
voltage. If voltage is present, repair/replace wire 75
of switch panel to gage panel and miscellaneous
switches wiring harness (see paragraph 6-55 for dual
voltage; 6-56 for single voltage). If voltage is not
present, replace stoplight switch (see paragraph 6-
23).
K
Reconnect
switch
panel
to
gage
panel
and
miscellaneous switches wiring harness to main
switch panel. Install main switch panel (11), flat
washer (10), ground lead (9), three lockwashers (8),
and three screws (7). Open air inlet doors.
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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