ALL LIGHTS FAIL TO LIGHT

Custom Search

Back
Table 4-2. Unit Troubleshooting

Up
TM-9-2330-380-14-P Semitrailer Van: Electronic Tactical 12-Ton 4-Wheel XM1063 (NSN 2330-01-224-9244) and M129A4 (NSN 2330-01-372-5642) Manual

ONE OR MORE LAMPS WILL NOT LIGHT

TM 9-2330-380-14&P

Table 4-2. Unit Troubleshooting (cont'd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 4. Check to see that current is flowing from towing vehicle, using a multimeter.

If proper voltage is obtained, proceed to step 5.

Step 5. Check wiring harness for short circuit.

Check cable for bare spots. Repair as necessary. Make a continuity test of all circuits,

using a multimeter. (Refer to wiring diagrams, starting on page 4-58).

If wiring harness is good, proceed to step 6.

Step 6. Checklightswitchontowingvehicle.

If switch is defective, replace switch.

If switch is good, proceed to step 7 (XM1063) or step 9 (M129A4).

Step 7. Remove resistor box cover and check resistor contact points (1).

Clean contact points.

If points are clean, proceed to step 8.

Step 8. Check resistors for rated ohms marked on resistors, using multimeter (refer to resistor box

wiring diagram, page 4-59).

Replace cracked, chipped or defective resistor (para. 4-23).

NOTE

M129A4 Registration Numbers NX0RKB and Subsequent LED lighting system voltage

converter boxes no longer contain fuses/circuit breakers.

Step 9. Remove voltage converter box cover and check circuit breakers.

Replace defective circuit breakers.

4-10