TM 9-2330-275-14&P
Table 4-1. Unit Troubleshooting Chart (con’t).
ELECTRICAL SYSTEM (con't).
4. BLACKOUT STOPLIGHTS AND TAILLIGHTS
INOPERATIVE (con’t).
Continued from step A
B. Turn towing vehicle master switch OFF. Dis-
connect IVC cable from distribution box. Dis-
connect wire 23 from both composite taillight
assemblies. Place multimeter red lead on pin
F of distribution box connector. Place multi-
meter black lead in sockets of two wires 23 of
chassis wiring harness. Check two wires 23 for
continuity.
IS CONTINUITY PRESENT?
wiring harness (para 4-25).
C. Disconnect wire 484-24 from wire 24 on left
composite taillight assembly. Place multimeter
red lead on pin A of distribution box connector.
Place multimeter black lead on wire 484-24
socket at left taillight disconnect. Check wire
484-24 for continuity. Repeat procedure on pin
C and wire 483-24 (right taillight).
IS CONTINUITY PRESENT?
wiring harness (para 4-25).
D. Connect IVC cable securely to towing vehicle
and dolly set control box receptacle. Turn
towing vehicle master switch ON. Remove
taillight cover from taillight assembly and re-
move inoperative light bulb(s) from sockets
(para 4-24). Engage service brake on towing
vehicle. Place multimeter red lead on center
contact in light socket assembly. Do not let red
lead touch side of socket. Ground black lead to
vehicle frame, ensuring metal-to-metal contact.
IS BATTERY VOLTAGE PRESENT?
Continued on next page
4-17
