Piper Dakota Maintenance Manual page 188

CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Trouble
Output indicated on am-
meter does not meet mini-
mum values specified in al-
ternator system test pro-
cedure. (cont)
Ficld circuit breaker trips.
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
Cause
High resistance connec-
tions in field or output cir-
cuit.
Open rectifier.
Short circuit in field circuit.
1I3
Remedy
Check visually for loose bind-
ing posts at the various junc
tion points in system, alter
nator battery post, lugs on
ammeter, connections at volt-
age regulator, circuit breaker,
etc. (See wiring schematic,
chapter 9 l .) Examine
crimped terminal ends for
signs of deterioration at
crimp or strands of broken
wire at crimp. Tighten any
loose binding posts or re-
place bad wire terminals.
If any of the six rectifiers
open up internally it will re-
sult in a definite limitation
on the current that can be
drawn from the alternator.
After having checked the
previous causes of low out-
put it can be assumed that a
faulty rectifier exists.
See Inspection and Testing
of Components.
Disconnect field wiring at
terminal of altemator. Turn
on master switch. If breaker
continues to trip, proceed to
disconnect each leg of field
circuit, working from the al-
ternator towards the circuit
breaker until breaker can be
reset and will hold. Replace
component or wire which
was isolated as defective. (See
wiring schematic, chapter
9l.)
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Page - 24 - 04
Reissued: August 1, 1986