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TM 5-2410-237-23
TROUBLESHOOTING PROCEDURES - CONTINUED
0006 00
Table 6. Electrical System Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
20. Defrosters Will Not Operate or Will Not
Operate in High Speed or Low Speed.
The following procedure is applicable for both front and
rear defroster fans.
1.
Test defroster fan circuit
voltage.
a. Place battery disconnect
switch in OFF position.
b. Check for blown defroster
1. Replace blown fuse with a
fan circuit fuse.
fuse of the same rating (WP
2. If fuse is not blown, reinstall
fuse and go to step c.
c. Identify high speed and
low speed control wires at
defroster control switch
with tags or similar ID
technique.
d. Disconnect high speed
and low speed control
wires from defroster
switch.
e. Set
to
appropriate voltage range.
f. Place battery disconnect
switch in ON position.
g. Place defroster control
switch to low speed
position and touch meter
positive lead to switch low
speed terminal. Observe
meter reading.
Change 1
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