Piper Navajo PA-31 Service Manual page 702

PIPER NAVAJO SERVICE MANUAL
IMPORTANT
Since the alternator
and regulator are designed for use
on only one polarity
system, the following precautions
must be observed when working on the charging circuit.
Failure to observe
these precautions will result in se-
rious damage to the electrical
equipment.
a. When installing
a battery, always make abso-
lutely sure the ground polarity
of the battery
and the ground
polarity of the alternator
are
the same.
b. When connecting
a booster battery, make cer-
tain to connect the negative
battery terminals
together and the positive battery termainls
to-
gether.
c. When connecting
a charger to the battery,
con-
nect the charger positive
lead to the battery
positive terminal and the charger
negative lead
to the battery negative terminal.
d. Never operate
the alternator on open circuit.
Make absolutely
certain all connections in the
circuit
are secure.
e. Do not short across or ground any of the ter-
minals on the alternator
or regulator.
f. Do not attempt to polarize
the alternator.
11-9. ALTERNATOR TEST AND MAINTENANCE.
11-10. INSPECTION.
At regular
intervals, inspect the terminals
for corrosion
and loose connections,
and the wiring for frayed insulation.
Check the mounting
bolts for tightness,
and the belt for alignment,
proper tension and wear.
Belt
tension should be adjustedin
accordance with engine manufacturer's
recommen-
dations. When tightening belt tension,
apply pressure
against the stator lamin-
ations between the end frames,
and not against either end frame.
Noise from an alternator
may be caused by worn or dirty bearings,
loose
mounting bolts, a loose drive pulley,
a defective diode, or a defective
stator.
Reissued: 10/12/79
ELECTRICAL SYSTEM
Effectivity
DELCO
4A24