Piper SARATOGA PA-32-301 Maintenance Manual page 167

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 2401. TROUBLESHOOTING (ALTERNATOR)
Trouble
Zero output indicated on
ammeter regardless of RPM
(refer to alternator system
test procedure)
Cause
Open field circuit.
Remedy
With master turned on,
check for battery voltage from
airplane's main buss through
entire field circuit to alterna-
tor field terminal. Measure
voltage from ground (-) to
the following points (+) in se-
quence: buss bar, output cir-
cuit breaker (60A), field cir-
cuit breaker (5A), field termi-
nals of master switch, voltage
regulator and alternator field
terminal.
Interruption of voltage
through any of these points
isolates the faulty component
or wire which must be re-
placed. (See wiring sche-
matic.)
Open output circuit.
With master switch turned
on, check for battery voltage
from airplane's main buss
through entire output circuit
to alternator battery post.
Measure voltage from
ground (-) to the following
points (+) in sequence: buss bar.
output circuit breaker,
ammeter, and alternator bat-
tery post.
Interruption of voltage
through any of these points
isolates the faulty compo-
nent or wire which must be
replaced. (See wiring sche-
matic, Chapter 91.)
Open circuit in alternator
output will usually burn out
the ALT annunciator lamp
and the 50 ohm resistor.
Check the 5A inline fuse.
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Page 24-02
Issued: January 2, 1980
1G23