Table 4-2. Unit Troubleshooting-continued -706880218

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

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).

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