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 353 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

77.

BOTH 24-VOLT TRAILER TURN SIGNAL LAMPS NOT WORKING.

NOTE

•

Blackout toggle switch must be

set to NORMAL

position and turn signal switch HAZARD control set to on

position when doing the following checks.

•

It is assumed here that chassis turn signal

lamps

are

OK.

Apply

same troubleshooting technique for either cab

or chassis connector.

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 75,

step 4.

2-228