PIPER
SENECA
II
SERVICE
MANUAL
SEAL- INSTALL SEAL
WITH LIP
TOWARD
BEARING
INNER
RACE
GREASE
CAVITY
I
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SPACER
Figure 11-8. Slip Ring End
Bearing Assembly
!
i
Figure 11-9. Testing Alternator
11-14. PRECAUTIONS. The following precautions are
to
be observed when testing
or
servicing the
electrical system:
a.
Disconnect
the
battery before connecting
or
disconnecting test instruments (except voltmeter)
or
before removing
or
replacing any
unit
or
wiring. Accidental grounding or shorting at the regulator,
alternator, ammeter, or accessories will cause severe damage to
the
units
and/or
wiring.
b. The
alternator
output
lead must
not
be removed from the alternator with the field circuit
energized and the alternator operating.
c.
Do
not
attempt
to
polarize the alternator. No polarization
is
required. Any
attempt
to
do
so
may
result in damage to the alternator, regulator
or
circuits.
d. Grounding
of
the alternator
output
terminal may damage the alternator
and/or
circuit and
components.
e. Reversed
battery
connections may damage the rectifiers, aircraft wiring,
or
other
components
of
the charging system. Battery polarity should
be
checked with a voltmeter before connecting the battery.
The Seneca II has a negative ground.
f.
If
a booster
battery
or fast charger
is
used, its polarity must be connected correctly
to
prevent
damage
to
the electrical system components.
g.
When using an auxiliary power unit, make sure
the
voltage and polarity are set to correspond
with the aircraft system voltage
and
polarity.
Reissued:
10/11/79
ELECTRICAL
SYSTEM
2G7
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