Piper SARATOGA PA-32-301 Maintenance Manual page 170

Internal short circuiting of
the field can occur at various
positions of the rotor. there-
fore. reconnect field, reset
breaker, pull propeller slowly
by hand turning alternator
rotor through
36
0 of travel.
Observe circuit breaker for
signs of tripping.
- CAUTION -
Turn magneto switch to off
before turning propeller.
24-02-00
Page 24-05
Issued: January 2, 1980
PIPER AIRCRAFT
PA-32-30 /301T
MAINTENANCE MANUAL
CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Trouble Cause
Remedy
Field circuit breaker
trips. (cont)
Short circuit in field
winding of alternator.
Disconnect field wiring at
terminal of alternator. Turn
on master switch. Reset
breaker and if breaker fails
to retrip, this isolates short
circuit to field of alternator
itself. Check brush holders
for shorting against frame. If
there are no obvious signs of
a physical short circuitat field
terminal or brush holder, re-
place alternator. (Note: inter-
mittent short circuit.)
Ammeter indicates 60 amps
at 1400 RPM and above.
ALT annunciator light on.
Battery installed with re-
versed polarity.
Short to ground in alterna-
tor output wiring.
Battery charged backwards.
Check condition of teflon
insulators on feet of diode
heat sink. When the mount-
ing screws are overtorqued.
they can cut through insula-
tors causing a short-to-
ground. Check other wiring
for chafing, etc.
Remove battery and reinstall
with correct polarity.
1H2