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Table 4-2. Unit Troubleshooting-continued -706880217
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Table 4-2. Unit Troubleshooting-continued -706880219
TM 5-4210-233-14&P-1
Table 4-2.
Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM-CAB CONTROLS AND INDICATORS-Continued
23
INTER-AXLE LOCKOUT INDICATOR DOES NOT ILLUMINATE WHEN AXLES ARE LOCKED
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 2 of 16.)
Step 1. Check bulb.
Replace bulb (see para 4-95).
Step 2. Check under dash PSI switch for proper operation.
Replace switch (see para 4-9.4).
Step 3. Check for +12V at circuit breaker #5 on ignition buss.
Replace breaker (see para 4-99).
Step 4. Check wiring for continuity.
Replace wire (see para 4-9.4).
24
CAB HEATER FAN DOES NOT OPERATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 3 of 16.)
Step 1. Check blower motor for proper ground.
Repair ground (see para 4-9.4).
Step 2. Check blower motor.
Replace blower motor (see para 4-9.4).
Step 3. Check switch.
Replace switch (see para 4-102).
Step 4. Check for +12V at circuit breaker #3 on ignition accessory buss.
Replace breaker (see para 4-99).
Step 5. Check wiring for continuity.
Replace wire (see para 4-9.4).
4-89

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