Table 4-2. Unit Troubleshooting - Continued

TM 5-4930-233-14

TM 4930-14/1

Table 4-2. Unit Troubleshooting - Continued

ITEM

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

13.

ONE OR MORE (NOT ALL) LAMPS FAIL TO LIGHT

Step 1. Check towing vehicle light operation

Troubleshoot towing vehicle electrical (Towing Vehicle Technical Manual).

Step 2. Inspect wiring for loose connections or damage.

Replace or repair as necessary (para 4-56).

Step 3. Test lights that are out (para 4-54 or 4-55).

Replace lights as required (para 4-54 or 4-55).

Step 4. Test junction box (para 4-53).

Replace junction box (para 4-53).

14.

ONE OR MORE CONTROL PANEL GAUGES FAIL TO OPERATE OR GIVE REQUIRED READINGS NOTE

NOTE

Step 1 applies only to Fuel Gauge.

Step 1. Check for fuel in fuel tank.

Fill fuel tank

Step 2. Troubleshoot air compressor (Table 4-2, malfunction 7. and 9.).

Replace air pressure gauge (para 4-25).

Step 3. Test wiring harness connection to gauge(s).

Replace or repair wiring harness (para 4-25).

Step 4. Replace gauge(s) (para 4-25).

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