24-02-00
Page 24-05
Revised: August 17, 1982
1H24
CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Field circuit breaker trips. Short circuit in field wind- Disconnect field wiring at
(cont) ing of alternator. 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.
Output circuit defective. Short circuit in output cir- Disconnect wiring at battery
cuit. 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.)
Battery installed with re- Remove battery and reinstall
versed polarity. with correct polarity.
Trouble Cause Remedy
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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