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.
C Place red lead of multimeter on pin A of wire 402
and black lead to ground. Turn MASTER switch on,
HEATER CONTROL switch to START, and check
for voltage. Place HEATER CONTROL switch in
RUN position and check for voltage. Turn MASTER
and HEATER CONTROL switches OFF. If voltage
is present, go to step D. If voltage is not present,
replace HEATER CONTROL box (see paragraph
6-12).
D Place red lead of multimeter on pin C of wire 403
and black lead to ground. Turn MASTER switch on,
HEATER CONTROL switch to START, and check
for voltage. Place heater controls switch in RUN
position and check for voltage. Turn MASTER and
HEATER CONTROL switches OFF. If voltage is
present, go to step E. If voltage is not present,
replace HEATER CONTROL box (see paragraph 6-
12).
E Place red lead of multimeter on pin C of wire 403
and black lead on pin E of wire 407. Check for
continuity. If continuity is present, go to step F. If
continuity is not present, replace HEATER
CONTROL box (see paragraph 6-12).
2-234
