Piper Arrow IV Turbo Maintenance Manual page 192

CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Trouble
Field circuit breaker trips.
(cont)
Output circuit defective.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Cause
Short circuit in field wind-
ing of alternator.
Short circuit in output cir-
cuit.
Battery installed with re-
versed polarity.
1H24
Remedy
Disconnect field wiring at
terminal of alternator. Turn
on master switch. Reset
breaker and if breaker fails to
retrip, this isolates short cir-
cuit to field of alternator
itself. Check brush holders
for shorting against frame.
If there are no obvious signs
of a physical short circuit at
field terminal or brush holder,
replace alternator. (Note: In-
termittent short circuit.) In-
ternal 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 360° of travel.
Observe circuit breaker for
signs of tripping.
—CAUTION—
Turn magneto switch to off
before turning propeller.
Disconnect wiring at battery
post of alternator. Turn on
master switch. Disconnect
each leg of output circuit,
working from the alternator
towards the bus bar. Replace
component or wire which was
isolated as defective. (See
wiring schematic, Chapter 91.)
Remove battery and reinstall
with correct polarity.
24-02-00
Page 24-05
Revised: August 17, 1982