TM-9-2320-283-20-1

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3

DECEMBER 1983

TM-9-2320-283-20-1 - Page 355 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

78.

ONE 24-VOLT TRAILER TURN SIGNAL LAMP NOT WORKING.

NOTE

•

Blackout toggle switch must be set to NORMAL

position and turn signal switch set for right turn when doing

the following check.

•

It is assumed here that chassis turn signal

lamps are

OK.

Faulty

right trailer turn signal lamp is shown in this

procedure.

Apply similar troubleshooting

technique for

left trailer turn signal switch lamp.

1.

Disconnect turn signal

switch connector, and

go to step 2.

2.

Connect jumper wire

between circuit 35C-YL

and yellow wire at turn

signal connector, and

go to step 3.

3.

Check for voltage at

12-volts dc

Remove jumper

Replace turn

circuit 37G-YL or

nominal.

wire, connect

signal switch

36G-DG of turn signal

turn signal

(para 3-80).

switch connector.

switch connec-

tor, and go to

step 4.

4.

Go to malfunction 76,

step 4.

2-230