
8-31. HARNESS ASSEMBLY.
8-32. INSPECTION OF HARNESS
a. Check lead assemblies for nicks, cuts, mutilated braiding, badly worn section or any other evidence of
physical damage. Inspect spark plug sleeves for chafing or tears and damage or stripped threads on coupling
nuts. Check compression spring to see if it is broken or distorted. Inspect grommet for tears. Check all
mounting brackets and clamps to see that they are secure and not cracked.
b. Using an ohmmeter, buzzer, or other suitable low voltage device, check each lead for continuity. If
continuity does not exist, wire is broken and must be replaced.
c. For electrical test of harness assembly, use a high voltage, direct current tester such as the TAKK
Model 86 or 86A or an equivalent direct current high voltage tester capable of delivering a test potential of
10,000 volts. Connect ground lead to high voltage tester to outer shielding braid of a single lead. Connect
plug terminal. Turn tester "ON" and apply 10,000 volts. The insulation resistance should be 100 megohms
minimum. Proceed to check other leads of harness in same manner.
d. Minor repair of the harness assembly, such as replacement of contact springs, spring retainer
assemblies, insulating sleeves or of one lead assembly, can be accomplished with the harness assembly
mounted on the engine. However, should repair require replacement of more than one lead assembly or of a
cable outlet plate, the harness should be removed from the engine and sent to an overhaul shop.
THIS SPACE INTENTIONALLY LEFT BLANK
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
POWER PLANT
1K4