Using semitrailer electrical schematic (figure FO-1) as a guide, tag and disconnect socket connector (1) from W2
Tag and disconnect white wire (ground) by removing screw (2) and terminal lug (3) from platform.
Remove four screws (4) and lockwashers (5) and remove vehicular bar lamp (6) from platform.
Remove three marker clearance lights (7) from bar lamp (6) by turning and/or twisting marker clearance lights (7).
Inspect wires, terminal lug, and socket connectors for corrosion, frayed or broken wires, and looseness. If socket
connectors or terminal lugs are defective, use electrical repair kit and replace as required. If wires are frayed or
broken, replace vehicular bar lamp.
Inspect marker clearance light sockets for corrosion and defects. If corroded, clean sockets by wiping with a
wiping rag. If sockets cannot be cleaned or if sockets are defective, replace vehicular bar lamp.
Inspect for burned out, missing, cracked, or nonsealing marker clearance lights. If defective, replace marker