SERVICE STOP LIGHTS INOPERATIVE

TM 10-3930-638-24&P

2-24. LIGHT SYSTEMS TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

5. BLACK OUT STOP LIGHTS INOPERATIVE (cont)

Step 2. (cont)

b. If ohmmeter indicates less than 0.1 ohm for both tests, check for open circuit in wire between

terminal N of cable connector and black out stop lights.

6. SERVICE STOP LIGHTS INOPERATIVE

NOTE

If one stop light operates normally, replace bulb in affected stop light

(para 2-30d). If stop light is still inoperative, check for open circuit in wire

between inoperative stop light and operating stop light.

Unscrew and remove cable connector from bottom of VEHICLE

Step 1.

LIGHTS switch.

Place main switch lever on VEHICLE LIGHTS switch in STOP

LIGHT or SER. DRIVE position.

Connect ohmmeter leads to pins A and F of VEHICLE LIGHTS

switch and check for less than 0.1 ohm, then connect ohmmeter

leads to pins K and C and check for less than 0.1 ohm.

a. If ohmmeter indicates more than 0.1 ohm for either test,

replace VEHICLE LIGHTS switch (para 2-28b).

b. If ohmmeter indicates less than 0.1 ohm for both tests, check

for open circuit in wire between terminal C of cable

connect or and service stop lights. If continuity test of wire

is satisfactory, proceed to step 2.

Step 2. Disconnect wires from stop light switch and connect

ohmmeter leads to terminals of stop light switch.

Note ohmmeter indication while an assistant depresses

brake pedal.

a. If ohmmeter does not indicate less than 0.2 ohm,

replace stop light switch (para 2-3le(2)).

b. If ohmmeter indicates less than 0.2 ohm with

brake pedal depressed, check for open circuit in

wiring between stop light switch and terminals A

and K of cable connector.

7. REAR FLOOD LIGHTS INOPERATIVE

NOTE

If one rear flood light operates normally, replace bulb in affected flood light

(para 2-30a). If flood light is still inoperative, check for open circuit in wire

between inoperative flood light and REAR FLOOD switch.