Table 3-1. Operator's Troubleshooting - Continued

TM 5-4930-233-14

TM 4930-14/1

Table 3-1. Operator's Troubleshooting - Continued

ITEM

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2. Check lower portion of transfer pump for obstructions.

Clean lower portion of transfer pump.

TRAILER ELECTRICAL

ALL LAMPS DO NOT LIGHT.

Step 1. Check light switch position on towing vehicle.

Place switch in correct position (Towing Vehicle Technical Manual).

Step 2. Check electrical connections on the trailer and towing vehicle.

Reconnect all incorrectly connected harnesses.

Step 3. Inspect trailer wiring harness for damage.

Notify unit maintenance of damaged wiring harness.

ONE OR MORE (BUT NOT ALL) LIGHTS WILL NOT LIGHT

Step 1. Check for damaged or broken electrical leads.

Notify unit maintenance.

Step 2. Check for loose or damaged electrical connections.

Tighten loose connections. If damaged, notify unit maintenance.

AIR BRAKES

AIR BRAKES WILL NOT RELEASE

Step 1. Check position of air supply valve.

Release parking brake if set.

Step 2. Check for proper connection of air brake couplers.

Connect air brakes correctly (paragraph 2-7).

Step 3. Check towing vehicle controls for correct positions.

Place controls in correct positions (Towing Vehicle Technical Manual).

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