Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 208 / 881

CHART 2401. TROUBLESHOOTING (ALTERNATOR)
Trouble Cause Remedy
ALTERNATOR (cont)
Output indicated on ammeter High resistance connections Check visually for loose
does not meet minimum in field or output circuit. binding posts at the various
values specified in alternator junction points in system,
system test procedure. (cont.) alternator battery post, lugs
on ammeter, connections at
voltage regulator, circuit
breaker, etc., (See wiring
schematic.) Examine crimped
terminal ends for signs of
deterioration at crimp or strands of
broken wire at crimp. Tighten
any loose binding posts or replace
bad wire terminals.
Open rectifier. If any of the six rectifiers
pressed into the rear bell
housing of the alternator
open up internally, it will
result i a definite limitation
on the current that can be
drawn from the alternator.
After having checked the previous
causes of low output it can be
assumed that a faulty rectifier exists.
See Paragraph titled Inspection
and Testing of Components.
Field circuit breaker trips. Short circuit in field circuit. Disconnect field wiring at
terminal of alternator. Turn
on master switch. If breaker
continues to trip, proceed to
disconnect each leg of field
circuit, working from the
alternator towards the circuit
breaker until breaker can be
reset and will hold. Replace
component or wire which was
isolated as defective. (See
wiring schematic.)
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2 4 - 0 2 - 0 0
Page 24-04
Revised: May 15, 1989
1I16
PIPER AIRCRAFT