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 105 of 524

TM5-2330-378-14&P

4-16. TROUBLESHOOTINGCHART(continued).

a.

LIGHTS (continued)

(3)

ONE OR MORE CLEARANCE LIGHTS DO NOT

WORK (M870) (continued).

CONTINUED

FROM STEP B

C.

Open junction box for light. Cut wire at connec-

tor.

Set multimeter

at 30 V dc; place red probe

into feeder wire, and ground black probe.

Does multimeter

show any voltage?

F

Replace feeder wire between light and main

9

wir

wiring harness (refertowiring

diagram, Appendix

K

Verify problem is solved.

Replace lamp socket (para4-29). Verify problem

2

is solved.

CONTINUED

FROM STEP A

D.

Open front cover of voltage reduction box (1)

(para 4-35). Locate harness junction block (2).

With power connected to semitrailer and using

multimeter

set at 30 V c1c,place red probe on

junction blockterminals (refertowiring diagram,

Appendix K) and ground black probe.

Does multimeter

show any voltage?

Replace bad circuit (para 4-34). Verify problem

24-VOLT

is solved.

E.

Unhook intervehicular cable connector (3). Us-

ing multimeter

set at 30 V dc, place red probe on

pin in intervehicular cable connector that con-

3

nects to circuitwith

nonworking

lights and place

black probe on good ground on towing vehicle.

Does multimeter

show any voltage?

12-VOLT

continued

on next page

4-17