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TM 10-3930-669-20
WARNING
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts battery terminal, a
direct short may result in instant heating of tools, damage to equipment, and injury or death to
personnel.
VOLTAGE TEST
(1)
Remove heater blower switch
(Para 7-12). Do not disconnect
wires.
(2)
Disconnect wire 38 from blower
switch.
(3)
Set multimeter select switch to
VOLTS DC.
(4)
Connect positive (+) multimeter lead
to wire 38.
(5)
Connect negative (-) multimeter
lead to a known good ground.
(6)
Set MAIN POWER switch to ON
position (TM 10-3930-669-10).
(7)
Set engine switch to ignition position
(TM 10-3930-669-10).
(a)
If there are not 22 to 24 vdc
present, perform Steps (8)
through (11) below and go to
Step 4 of this Fault.
(b)
If there are 22 to 24 vdc present,
perform Steps (8) and (9) below
and go to Step 2 of this Fault.
(8)
Set engine switch to off position.
(9)
Set MAIN POWER switch to OFF
position.
(10) Connect wire 38 to heater blower
switch.
(11) Install heater blower switch.
CONTINUITY TEST
(1)
Disconnect wires 1 and 38.
(2)
Set blower switch to HIGH position.
(3)
Set multimeter select switch to OHMS,
(4)
Check continuity between blower
switch lead wire 4 and wire 38
terminals.
(a)
If there is no continuity, replace
heater blower switch (Para 7-12).
(b)
If there is continuity, heater
blower switch is OK.
(5)
Set blower switch to OFF position.
(6)
Connect wires 1 and 38 to heater
blower switch.
(7)
Install blower switch.
2-221
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