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 103 of 576

TM 9-2330-227-14&P

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

6. ONE OR MORE, BUT NOT ALL LIGHTS WILL NOT WORK

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Check switches to make sure they are on. If switches are off, turn

on (page 2-8).

NOT E

Perform troubleshooting steps 2 thru 4 for all lights not working.

Go to light not working and pull cover off lens. Take out

lamp.

If there are obvious signs of damage to lamp or sockets,

disconnect power supply and notify Direct Support Maintenance.

Using multimeter set to read voltage, put red probe on contact

for lamp socket and black probe on ground.

If multimeter does not read approximately 110-vac,

replace lamp (page 4-31).

Using multimeter set to read voltage, put red probe on

power wire coming into light assembly and black probe on

ground wire.

If multimeter does not read approximately 110-vac,

replace light assembly (page 4-31).

Disconnect power source. Using multimeter set to read continuity,

put red probe on one end of wire for light closest to

rear and black probe on the other end of wire on the same side

where it connects to closest working light in that row.

a. If multimeter shows no continuity, wire needs replacement.

Notify Direct Support Maintenance.

b. If multimeter shows continuity, wire on other side

needs replacement. Notify Direct Support Maintenance.

Repeat step 5 for lights in the other row.

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