Piper Navajo PA-31 Service Manual page 775

I
PIPER NAVAJO SERVICE MANUAL
TABLE XI-I. TROUBLESHOOTING
CHART (ELECTRICAL SYSTEM)
Trouble
Cause
Remedy
ALTERNATOR
No output from
alternator.
Reduced output from
alternator.
Malfunction of alterna-
tor, alternator output
circuit or field circuit.
Open diode.
Check alternator output
and field circuits.
Refer to Para.
11-7,
11-27 or 11-40.
Check alternator.
Refer
to Paragraph 11-7.
STARTER
Motor fails to oper-
ate.
Low battery
charge.
Check and recharge if
necessary.
Defective or improper
wiring or loose connec-
tions.
Defective starter
sole-
noid or control
switch.
Binding, worn,
or im-
properly
seated brush,
or brushes with exces-
sive side play.
Refer to wiring diagram
and check all wiring.
Replace faulty unit.
Brushes should be a free
fit in the brush boxes
without excessive side
play. Binding brushes
and brush boxes should
be wiped clean with a
gasoline (undoped)
moistened cloth.
A
new brush should be
run in until at least 50%
seated; however, if
facilities
are not avail-
ELECTRICAL SYSTEM
Revised: 10/12/83
4E1