SERVICE TAIL LIGHTS INOPERATIVE

TM 10-3930-638-24&P

2-24. LIGHT SYSTEMS TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. SERVICE TAIL LIGHTS INOPERATIVE

NOTE

If one service tail light operates normally, replace bulb in affected tail light

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

between inoperative tail light and operating tail light.

Unscrew and remove cable connector from bottom of VEHICLE

LIGHTS switch.

Place main switch lever on VEHICLE LIGHTS switch in SER.

DRIVE position.

Connect ohmmeter leads to pins H and F of VEHICLE LIGHTS

switch.

a. If ohmmeter indicates more than 0.1 ohm, replace

VEHICLE LIGHTS switch (para 2-28b).

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

open circuit in wire between terminal H of cable

connector and service tail lights.

5. BLACK OUT STOP LIGHTS INOPERATIVE

NOTE

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

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

between inoperative stop light and operating stop light.

Step 1.

Place IGNITION switch in ON position, VEHICLE LIGHTS switch in SER. DRIVE position,

and depress brake pedal.

a. If service brake lights operate normally, turn IGNITION switch and VEHICLE LIGHTS switch

to OFF position and proceed to step 2.

b. If service brake lights are inoperative, trouble-

shoot stop light switch (para 2-24, MAL-

FUNCTION 6).

Step 2. Unscrew and remove cable connector from bottom of VEHICLE

LIGHTS switch.

Place main switch lever on VEHICLE LIGHTS switch in B.O.

MARKER or B.O. 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 N 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).