PARKING BRAKE VALVE STOPLIGHT SWITCH INOPERATIVE.

TM 9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

34. PARKING BRAKE VALVE STOPLIGHT SWITCH INOPERATIVE.

Step 1.

Start engine, build air pressure to operational level, and shut down engine

(TM 9-2320-270-10). Have assistant apply brakes.

If stoplights do not work, release brakes and go to STOPLIGHT DOES NOT

WORK WHEN TRACTOR BRAKES ARE APPLIED (page 3-87).

Release brakes, open instrument panel (page 4-244). At stop-

Step 2.

light switch (1), using multimeter set at 30 vdc, put red probe on wire

no. 359 (2) and black probe to good ground.

If meter reads no voltage, close instrument panel (page 4-244) and

notify direct support maintenance.

Step 3.

At stoplight switch (1), using multimeter set on 30 vdc, put red

probe on wire no. 360 (3) and black probe to good ground.

if meter reads no voltage, close instrument panel (page 4-244) and

replace stoplight switch (page 4-407).

TA239682

3-95