TM 9-4940-549-1
MAINTENANCE OF ELECTRICAL SYSTEM
WIRING.
General. Check insulation for cracks and frayed places. Pay parti-
a.
cular attention to places where wires pass through holes in the frame
or over sharp metal edges. If any wire is found to be defective,
replace it following its respective wiring diagram. Solder all terminal
connections to insure good electrical contact. If the defective wire
is part of a rubber, molded wiring harness, and cannot be replaced
without disassembly, replace the harness.
Remove all power. Test the electrical
Testing 110-volt Wiring.
b.
leads for continuity. Disconnect each end of the wire from the com-
ponents to which it is connected (refer to wiring diagram). Check
for continuity and replace any defective wire with the same size wire
as removed. Reinstall the circuit tag number.
Testing 24-Volt Wiring Harness. Refer to the appropriate wiring dia-
c.
gram and test the harness for continuity in the same manner as de-
scribed in b above.
6-1, 6-2, and FO-1 thru FO-4).
Replacement {Refer to figures
d.
(1) Tag and disconnect all electrical leads as necessary.
(2) To replace a wire that is not part of a wiring harness, discon-
nect it at each end and install a new wire of the same wire
size as the one removed.
(3) If a defective wire is part of a wiring harness or cable assem-
bly that cannot be reassembled, replace the entire harness or
cable assembly.
(4) Connect lead as tagged in (1) above. Reinstall the circuit tag
number.
SERVICE AND BLACKOUT CLEARANCE LIGHTS.
Removal. Remove the service and blackout clearance lights as illus-
a.
trated in figure 6-3.
b.
Cleaning and Inspection.
(1) Clean all parts with approved cleaning solvent and dry thorough-
ly.
(2) Inspect all parts for damaged threads, bends, cracks, breaks
and other damage. Inspect for a defective lamp and any corro-
sion. Replace any defective parts.
Installation. Install the service and blackout clearance lights as il-
c.
lustrated in figure 6-3.
