CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
PERSONNEL HEATER CONTROL SYSTEM-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.
I Place red lead of multimeter in socket D of wire 405
and black lead to ground. Turn MASTER switch on,
HEATER CONTROL switch to START, and check
for voltage. Turn MASTER and HEATER
CONTROL switches OFF. If voltage is present, go
to step J. If voltage is not present, repair/replace
wire 405 of heater control box to heater wiring
harness (see paragraph 6-87).
J Reconnect heater control box to heater wiring
harness to personnel heater. Disconnect wire 402
from heater fuel pump. Place red lead of
multimeter in wire 402 and black lead to ground.
Turn MASTER switch on, HEATER CONTROL
switch to START, and check for voltage. Turn
MASTER and HEATER CONTROL switches OFF.
If voltage is present, go to step K. If voltage is not
present, repair/replace wire 402 of heater control
box to heater wiring harness (see paragraph 6-87).
K Reconnect wire 402 to heater fuel pump. Disconnect
fuel line from fuel pump. Turn MASTER switch on,
HEATER CONTROL switch to START, and check
for fuel flow. Turn MASTER and HEATER
CONTROL switches OFF. If fuel flow is present,
troubleshoot personnel heater (TM 9-2540-205-
24&P). If fuel flow is not present, replace heater
fuel pump (see paragraph 10-2).
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