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 108 of 524

TM5-2330-378-14&P

4-16. TROUBLESHOOTINGCHART(continued).

a. LIGHTS (continued)

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

CONTINUED

FROM STEP C

Replace red wire between stoplight andjunction

box under rear ramp of semitrailer

(refer to

wiring diagram, Appendix K). Verify problem is

solved.

Replace light assembly (para 4-32).

Verify

problem

is solved.

CONTINUED

FROM STEP A

D.

Remove cover from voltage reduction box (1).

Connect intervehicular cable to terminal. With

multimeter

set at 30 V c1c,place red probe on

terminal for red harness wire (refer to wiring

diagram, Appendix

K) on junction block and

ground

black probe while assistant

applies

brakes.

Does multimeter show any voltage?

9

Replace red wire from voltage reduction box to

junction box under rear semitraiter ramp (referto

wiring diagram, Appendix K). Verify problem is

solved.

E.

Disconnect intervehicular cable connector (2).

Using multimeter

set at 30 V c1c,place red probe

on pin for bad circuit, and place black probe on

good ground on towing vehicle.

Does multimeter

show any voltage?

2

co .

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