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Page Title:
HEATER DOES NOT OPERATE - continued |
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 TM 10-3930-673-20-1
A
HEATER AND
IR CONDIS IONER
T
SCREW
WITCH
PANEL
VOLTAGE TEST
(1) Set multimeter to volts dc.
(2) Connect multimeter positive lead (+) to
heater/air conditioner switch where red/
white wire connects pin 2.
(3) Connect multimeter negative lead () to
known good ground.
(4) Turn engine start switch to START
position, START ENGINE
(TM 10-3930-673-10).
(5) Turn heater/air conditioner switch to
HEATER (TM 10-3930-673-10)
8 1 2 3
(a) If voltage is present, go to
7 4 5 6
Mechanical System
S
ENGINE
Troubleshooting, Fault 25, Cab
TART SWITCH
heater does not heat cab.
RED/WHITE
W
(b) If voltage is not present, replace
IRE
heater/air conditioner switch
(Para 8-7).
(6) Turn heater/air conditioner switch OFF
(TM 10-3930-673-10)
(7) Turn engine start switch to OFF
position (TM 10-3930-673-10).
A
HEATER AND
IR CONDIS IONER
T
WITCH
TR01074
2-447
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