TM 5-3805-296-23-2
0134
Table 1. Blower Motor Does Not Operate in One or More Speeds Continued.
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MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Blower Motor Does Not
3. Using digital multimeter
Resistance 5.0 Ohms or Less
Operate in One or More
(WP 0540), measure resistance
Proceed to Test Step 6.
Speeds Continued
between connector W-C22
Resistance Greater Than 5.0 Ohms
terminal 6 (WP 0012, Figure 271)
Replace main cab wiring harness
and ground.
(WP 0505).
Proceed to Test Step 38.
Test Step 6. Test Voltage to Fan
Speed Switch.
1. Remove four bolts
(Figure 1, Item 2) and plate
(Figure 1, Item 1) from headliner
(Figure 1, Item 3).
Figure 1. Plate and Retaining Hardware.
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2. Disconnect connector H-C3
(WP 0012, Figure 250) from fan
speed switch (WP 0012,
Figure 249).
3. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-296-10).
4. Using digital multimeter
Voltage 18 to 26 V Proceed to Test
(WP 0540), test for voltage
Step 7.
between connector H-C3
Voltage Less Than 18 V Proceed to
terminal 1 (WP 0012, Figure 250)
Test Step 9.
and ground.
Test Step 7. Test Headliner Wiring
Harness for High Resistance or
Open.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).