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 337 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

75.

BOTH 24-VOLT TRAILER STOPLAMPS NOT WORKING.

NOTE

•

Blackout toggle switch must be set to NORMAL

position,

air

system

pressurized to 105 psi, and brake

pedal depressed by assistant when doing the following

checks.

•

It is assumed here that chassis stop- lamps are

OK.

Apply

same

trouble- shooting technique for either cab or

chassis connector.

1.

Disconnect turn signal

switch connector, and

go to step 2.

2.

Connect jumper wire

between circuit 25D-RD

and gray-black wire

terminal of turn signal

switch, and go to step

3.

3.

Check for voltage at

12-volts dc

Go to step 4.

Replace turn

either circuit 36G-DG

nominal.

signal switch

or 37G-YL of turn

(para 3-80).

signal switch connec-

tor.

2-212