Table 4-2. Unit Troubleshooting-continued -706880228

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

CAB SPEEDOMETER DOES NOT INDICATE VEHICLE SPEED

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 2 of 16.)

Step 1. Check gauge.

Replace gauge (see para 4-93).

Step 2. Check for +12V at circuit breaker #1 on ignition accessory buss.

Replace breaker (see para 4-99).

Step 3. Check wiring from pulse generator to gauge for continuity.

Replace wire (see para 4-9.4).

Step 4. Check pulse generator (sender) for proper operation.

Replace pulse generator (see para 4-9.4).

ELECTRICAL SYSTEM - EMERGENCY MASTER CIRCUITS

EMERGENCY MASTER SWITCH DOES NOT ENERGIZE EMERGENCY EQUIPMENT

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 3 of 16.)

Step 1. Check switch.

Replace switch (see para 4-94).

Step 2. Check emergency master solenoid for proper operation.

Replace solenoid (see para 4-9.4).

Step 3. Check for +12V at circuit breaker #9 on battery accessory buss.

Replace breaker (see para 4-99).

Step 4. Check wiring for continuity.

Replace wire (see para 4-9.4).

4-99