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 TM 9-2330-380-14&P
Table 3-1. Operator/Crew Troubleshooting (cont'd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. DIRECTIONAL SIGNALS INOPERATIVE
NOTE
M129A4 Registration Number NX0RKB and Subsequent semitrailers are equipped
with LED lighting systems. Lamps can not be replaced.
Step 1. Check operation of turn signal light assembly.
If lamp is defective, notify unit maintenance.
If lamp or light is not defective, proceed to step 2.
Step 2. Check for loose connection.
If connections are loose, tighten connections.
If connections are not loose, proceed to step 3.
Step 3. Check for dirty or corroded connectors.
If connectors are dirty or corroded, clean them.
If the above steps do not correct malfunction, notify unit maintenance.
5. ALL 110-VOLT LAMPS FAIL TO LIGHT (M129A4 ONLY)
Step 1. Check power cable connection at rear of trailer.
Remove plug and re-insert fully (para. 2-8).
If connection is not loose, notify unit maintenance.
6. ALL 110-VOLT RECEPTACLES INOPERATIVE (M129A4 REGISTRATION NUMBERS
NX0RKB AND SUBSEQUENT)
Step 1. Check for 110-volt power at the receptacles.
If no power is available at the 110-volt receptacles, check power cable connection at rear of trailer.
Remove plug and re-insert fully (para. 2-8).
If connection is not loose, notify unit maintenance.
BRAKE SYSTEM
7. BRAKES WILL NOT RELEASE
Step 1. Check that towing vehicle to semitrailer air supply is turned on.
If air is shut off, turn on air supply.
If air supply is on, proceed to step 2.
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