Piper Dakota - Troubleshooting (Alternator)

24 - 02 - 00
Page - 24 - 02
Reissued: August 1, 1986
1I1
CHART 2401. TROUBLESHOOTING (ALTERNATOR)
Zero output indicated on Open field circuit. With master switch turned on,
ammeter regardless of rpm check for battery voltage from
(refer to alternator system airplane’s main buss through
test procedure). 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 altemator 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 9l.)
Open circuit in alternator
output will usually burn out
the alt annunciator lamp
and the 50 ohm resistor.
Check the 5A inline fuse.
Trouble Cause Remedy
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL