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 323 of 926

TM 9-2320-283-20-1

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

64. ONE BLACKOUT STOPLAMP NOT WORKING.

NOTE

•·Blackout toggle switch must be set to BLACKOUT

position, air system pressurized to 105 psi, and brake

pedal depressed by assistant when doing the following

checks.

•Faulty right blackout stoplamp is shown in this

proceudre.

Apply similar troubleshooting technique for

left blackout stoplamp.

1.

Disconnect circuit

24C-PK from right

blackout stoplamp,

and go to step 2.

2.

Check for voltage at

12-volts dc

Connect circuit

Repair circuit

circuit 24C-PK terminal

nominal

24C-PK to

24C-PK (para

of connector

blackout stop-

3-127).

lamp and, go to

step 3.

NOTE

With positive lead on circuit 24C-PK, check ground with

negative lead when doing the following checks.

3.

Remove door from

blackout stoplamp (para

3-97), and go step 4.

4.

Check for voltage at

12-volts dc

Replace bulb

Clean socket

socket of stoplamp

nominal

(para 3-97)

connection,

assembly

and install

door to black-

out stoplamp

(para 3-97).

2-198