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 343 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

76.

ONE 24-VOLT TRAILER STOPLAMP 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- lamp

circuit

is

OK. Faulty right trailer

stoplamp is shown in this procedure.

Apply similar trouble- shooting technique for left trailer

stoplamp.

•

Do steps 1 thru 20 when troubleshooting 24-volt cab

connector.

•

Do steps 1 thru 19 and steps 21 and 22 when

troubleshooting 24-volt chassis connector.

1.

Disconnect turn signal

switch connector and,

go to step 2.

2.

Connect jumper wire

between circuit 25D-RD

and grey/black circuit,

and go to step 3.

3.

Check for voltage at

12-volts dc

Connect turn

Replace turn

circuit 36G-DG terminal

nominal.

signal connec-

signal switch

of turn signal switch.

tor, and go to

(para 3-80).

step 4.

2-218