Piper Warrior III - Page 290

PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 8
Nov 30/06 2D24
24-30-00
CHART 1 (Sheet 5 of 5)
TROUBLESHOOTING ALTERNATOR SYSTEM
Trouble Cause Remedy
Ammeter indicates 70 amps Short to ground in alternator Check output wiring for short
at 1400 rpm and above, ALT output wiring. to ground. Check other wiring
annunciator light on. for chafing, etc.
Excessive ammeter fluctuation. Excessive resistance Check all connections and
in field circuit. wire terminals in field circuit
for deterioration such as
loose binding posts, broken
wire strands at terminals,
etc. Tighten all connections
and replace faulty
terminals.
High field circuit resistance. If problem persists, jump
across the terminals of the
following components one
at a time until the faulty unit
is isolated.
a. Field 5-amp (alternator
circuit protector).
b. Alternator switch.
c. Overvoltage relay.
Defective voltage Replace voltage regulator.
regulator.
Faulty grounds, Completely clean all
from grounding points. corrosion. Ensure solid
ground.