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 107 of 524

TM 5-2330-378-14&P

4-16. TROUBLESHOOTINGCHART(continued).

a. LIGHTS (continued) (4) STOPLIGHTS DO NOT WORK (M870).

Initial Setup:

Tools/Test Equipment:

- Parking brake applied (see operators

manual

• Tool kit, general mechanic's:

automotive

for towing vehicle).

(item 7, Appendix B)

- Wheels chocked (para 2-10).

• Multimeter (item 8, Appendix 13)

Personnel Required:

Two

Equipment Conditions:

-Sernitrailer

coupled to towing vehicle. Engineoff

(see operators manual fortowing vehicle).

A. Are both stoplights inoperative?

GO TO STEP D

B.

Remove lens from light that does not work (para

4-32). Using multimeter set for continuity test-

ing, place red probe on base terminal and black

probe on side of light.

Is continuity present?

410000

Replace

bulb (pare 4-32).

Verify problem

is

so

ved.

C.

Remove light body from semitrailer.

Cut red

wires at connector.

Using multimeter

set at 30 V

dc, place red probe on red circuit wire and

ground

black probe while

assistant

applies

brakes.

Does multimeter

show any voltage?

continui

:)n next page

4-19