TM 9-2350-256-20
CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
2-19 ELECTRICAL TROUBLESHOOTING-Continued
ELECTRIC IN-TANK FUEL PUMP-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.
E Reconnect switch panel to gage panel and
miscellaneous switches wiring harness to main
switch panel. Disconnect switch panel to neutral
safety to bulkhead wiring harness from main
switch panel. Place red lead of multimeter in
socket E of wire 76 and black lead to ground. Turn
MASTER and FUEL PUMP switches ON and check
for voltage. Turn MASTER and FUEL PUMP
switches OFF. If voltage is present, repair/replace
wire
76 of switch panel to neutral safety to
bulkhead wiring harness (see paragraph 6-54). If
voltage is not present, go to step F.
F Reconnect switch panel to neutral safety to
bulkhead wiring harness to main switch panel.
Disconnect wire 76 from FUEL PUMP switch side of
15 A circuit breaker. Place red lead of multimeter
on terminal of 15 A circuit breaker and black lead to
ground. Turn MASTER switch on, and check for
voltage. Turn MASTER switch OFF. If voltage, is
present, go to step H. If voltage is not present, go to
step G.
G Reconnect wire 76 to FUEL PUMP switch side of 15
A circuit breaker. Disconnect wire 10 from 15 A
circuit breaker. Place red lead of multimeter in
wire 10 and black lead to ground. Turn MASTER
switch on and check for voltage. Turn MASTER
switch OFF. If voltage is present, replace circuit
breaker (see paragraph 6-10). If voltage is not
present, repair replace wire 10 of main lighting
and B.O. selector switch wiring harness (see
paragraph 6-69).
2-92