TM-5-2330-378-14-P

SEMITRAILER, LOWBED: 40 TON CONSTRUCTION EQUIPMENT TRANSPORTER M870 AND M870A1

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

JUNE 1999

TM-5-2330-378-14-P - Page 104 of 524

TM5-2330-378-14&P

4-16. TROUBLESHOOTINGCHART(continued).

a. LIGHTS (continued)

(3) ONE OR MORE CLEARANCE LIGHTS DO NOT

WORK (M870).

Initial Setup:

Toolsrrest

Equipment:

- Parking brake applied (see operator's

manual

-Tool kit, general mechanids:

automotive

fortowing vehicle).

(item 7, Appendix B)

- Wheels chocked (para 2-10).

- Multimeter (Item 8, Appendix B)

Equipment Conditions:

-Semitrailer coupled to towing vehicle. Engineoff

(see operator's manual for towing vehicle).

WARNIN6

ALWAYS

make sure all electrical

power

is disconnected

before performing any

maintenance

on the electrical

system.

Serious injuryordeath

mayoccurif

safety

precautions

are not observed.

A.

Check which lights do not work and compare to

electrical wiring diagram (Appendix K).

Are the lights that do notwork

all on the same circuit?

FGO

TO STEP D

B.

Remove lens from any clearance light that does

not work (pare 4-29). Remove bulb from socket.

Set multimeter for continuity testing; place red

probe on base terminal and black probe at side

of light.

Does multimeter

show continuity?

400.

1

4,0"'1

Replace bulb (para 4-29).

Verify problem is

sol

Fved.

continuedon next page

4-16