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 111 of 524

TM 5-2330-378-14&P

4-16. TROUBLESHOOTINGCHART(continued).

a.

LIGHTS (continued)

(5) TURN SIGNALS DO NOT WORK (M870) (continued).

CONTINUED

FROM STEP B

C.

Remove light body from semitrailer (para 4-32).

Cut brown orwhite wire from red lead wire (refer

to wiring diagram, Appendix K). Using multim-

eter set at 30 V dc, place red probe on brown or

white wire and ground black probe while assis-

tant applies brakes.

Does multimeter

show any voltage?

-A

-..db.-

I

_@q

_Iqw@

_411110,

Replace light assembly (para 4-32).

Verify

problem is solved.

D.

Remove

voltage

reduction box cover (pare

4-35). Connect intervehicular

cable to terminal.

With multimeter

set at 30 V dc, place red probe

on terminal for white or brown harness wire on

junction

box, and ground black probe while as-

sistant applies brakes.

Does multimeter show any voltage?

-ddk.-

r

Replace brown orwhitewirefrom

voltage reduction

ep

ce

ft or ri

'

box to left or right turn signal (para 4-34). Verify

ox 0 1

is solv

g

prob'tlaem is solved.

E. Unhook intervehicular cable connector (1). Us-

ing multimeter

set at 30 V dc, place red probe on

two pins for turn signals and ground black probe

on towing vehicle while assistant applies brakes.

ri

Does multimeter

show voltage on both pins?

I

continued

on

next

page

4-23