TM-9-2330-227-14-P

SEMITRAILER, VAN: SHOP, 6-TON, SINGLE AXLE, M146

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)

JUNE 1985

TM-9-2330-227-14-P - Page 99 of 576

TM 9-2330-227-14&P

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. ALL LIGHTS DO NOT WORK, EARLY M146 - CONTINUED

Step 12.

Step 13.

Step 14.

Step 15.

Step 16.

Continued

If multimeter reads no continuity, notify Direct Support Maintenance.

a. Remove front blackout switch (page 4-35). Using multimeter

set to read continuity, put red probe in contact on side with

just one contact. Put black probe in one of the contacts on

other side. Check reading on multimeter. Flip switch, and

check reading again.

b. Repeat step 13a, putting black probe in the other contact

on that side.

If multimeter reads no continuity in either step 13a or 13b,

replace switch (page 4-35).

Install front blackout switch (page 4-35). Repeat steps 13a and 13b

for rear blackout switch.

Install rear blackout switch (page 4-35).

Using multimeter set to read continuity, put red probe on one end of

wire leading from rear blackout switch to far side of right rear light

(ground side) and black probe on other end.

If multimeter reads no continuity, notify Direct Support Maintenance.

Using multimeter set for continuity, put red probe on one end of wire

leading from rear blackout switch to left main circuit breaker and

black probe on the other end.

If multimeter reads no continuity, notify Direct Support Maintenance.

5. ALL LIGHTS DO NOT WORK, LATE M146

Step 1.

Using multimeter set to read voltage, check power source to make sure

there is approximately 110-vac coming to the semitrailer.

If multimeter measurement is not approximately 110-vac,

troubleshoot power source.

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