4-38. W4 HARNESS (CONT)
Unscrew four captive screws (1) and remove two covers (2) from junction boxes TB1 (3) and TB2 (4).
Using semitrailer electrical schematic (figure FO-1) as a guide, tag and disconnect W4 harness (5) from platform
junction box terminal boards TB1 (3) and TB2 (4).
Tag and disconnect socket connectors for W4 harness (5) from platform lighting.
Cut and remove all tiedown straps from W4 harness (5) as required. Discard tiedown straps.
Remove W4 harness (5) from semitrailer platform.
Inspect terminal lugs (6) and electrical plug connectors (7) for frayed or broken wires and looseness. Clean as
required by wiping with a wiping rag. If defective, use electrical repair kit and replace as required.