4-28. BLACKOUT STOPLIGHT MAINTENANCE (EARLY MODEL) (Cont).
Remove two screws (8), door assembly (7), and gasket (6) from housing (2).
Push in on lamp (5), turn counterclockwise, and remove from socket (4).
Remove two shoulder screws (9), grommets (1 O), ground strap (11 ), and Iampholder (3) and wire (12) assembly
from housing (2).
d. CLEANING AND INSPECTION
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective goggles
and gloves, and use only in a well-ventilated area. Avoid contact with skin, eyes, and
clothes, and DO NOT breathe vapors. DO NOT use near open flame or excessive heat.
The solvents flash point is 100°F-138°F (38°C-59°C). If you become dizzy while
using cleaning solvent, immediately get fresh air and medical help. If solvent contacts
eyes, immediately wash your eyes and get medical aid.
Clean exterior of housing with dry cleaning solvent.
Clean interior of housing with soap and water, then dry thoroughly.
Inspect door assembly for cracks, warpage, cracked or broken lens, or evidence of leakage around door
assembly gasket. If damaged, replace gasket or door assembly.
Inspect housing for cracks or evidence of leakage. Replace housing if damaged.
Inspect Iampholder and wire assembly to ensure grommets, socket, ground strap (11 ), wire (12), and connector
are in good condition and will make a good watertight electrical connection when installed. Replace blackout
stoplight if parts of assembly are defective.
Inspect grommet at rear of assembly and terminal (15) at rear of lampholder and wire assembly to ensure they
are adhered securely to housing and will make a good watertight seal. Add adhesive as required.
Press ground strap (11 ) and Iampholder (3) and wire (12) assembly into housing (2) until grommet(13) at rear of
assembly is seated.
Aline holes in Iampholder (3) and wire (12) assembly with mounting holes in housing (2) and install two shoulder
screws (9) and grommets (10).
Install lamp (5) in socket (4), push in, and turn clockwise.
Position door assembly (7) and gasket (6) in place on housing (2) and install two screws (8).
Position housing (2) in place on rear crossmember and install bolt (17) and newIockwasher(16).
Connect connector (1) to housing (2).
Connect towing vehicle intervehicular cable to semitrailer (para 2-10).
Test operation of blackout stoplight.