e-
PIPER COMANCHE SERVICE MANUAL
f The
dri"e
end head
supports
a sealed. pre lubricated ball bearing
in
which the drive end
of
the
rotor
shaft
rotates
9-6Ic.
Checking Alternator
System.
The
ammeter
is
equipped
to
check the electrical
output-input
of
the
battery.
Should
the
alternator
show
no
output
on
the
ammeter.
check the
alternator
output
and
field
thermo
circuit protectors.
and
ammeter
line fuses. If a further check
of
the
ammeter
shows no
output
from
the
alternator.
check
the
alternator
system. I Refer to
F'gure
9-27b.)
a. Ascertain
that
the
ammeter
is
operating
properly
b. Disconnect
the
battery
lead
1+)
at
the
alternator
c. Disconnect the field leads
IFI
and
F2) at the
alternator.
d Ascertain
that
all electrical units
are
off
and
the
battery
is
fully charged.
e
Turn
on
the
master
switch
f.
To check the
alternator
output
circuit.
connect
a
voltmeter
or
12
volt test light
to
the battery lead
and
to ground
If
a reading
of
approxImately
12
volts registers
on
the
voltmeter
or
the test light lights. the
battery circuit
is
operational
Should
there
be
no indication
of
voltage. trace
back
through
the
output
circuit
until,
oltage
IS
!Odicated. ,'fer
to
Figure 9-27b ) A
component
that
allows
no
,oltage
to
pass
through
it
should
be
replaced.
g To check
the
field circuit. connect a
\oltmeter
or
12
volt test light
to
each
field lead
and
to
ground.
and
separately check
as
follows
I
A check
of
the F I circuit will gl\ e a
,ariable
voltage. if
any
voltage
is
indicated
on
the,
oltmeter
or
if
any
filament glow
is
indicated
on
the test light. the circuit
is
operational
2
The
check
of
the F2 circuit should
gi\e
a
reading
of
approximately
12
\olts
or
the test lamp
should
glow
normally
for
an
operational
circuit
:I
Both
the
main
and
auxiliar,
field circuits
may
be checked
in
a like
manner
4 If
indication
shows a possible
malfunction
of
the
\oltage
regulator
and
before installing a
new
regulator.
refer to
Paragraph
9'('lm
For
the
overvoltage
control.
refer to
Paragraph
9-615
h
If
\oltage
is
indicated
at
both
the
battery
lead
and
field lead. the
alternator
should
be
checkcd for
po,,,ble
malfunction. refer
to
Paragraph
9-l>li
9-old
Adjustment
•.
The
only
adjustments
necessary to
maintain
the
alternator
system
is
the
adjustment
01
,
the
,oltage
control
on
the
\oltage
regulator A
\oltage
of
14.2 volts.is maintained All
other
control
adjust·
ments
are made
at
time of installation
and
need not be reset
IMPORTAl\T
Since the
alternator
and
regulator
are
designed for use
on
onlv one
polarit'
system. the following
precautions
must be observed
when
working
on
the charging unit. Failure
to
observe these
precautions
will result in serious
damage
to the electrical
equipment
a When installing a battery. always
make
absolutely sure
the
ground
polarit\' of the battery
and
thl
ground
polarity
of
the
alternator
are
the same.
b
When
connecting
a
booster
battery.
make
cenain
to
connect
the negati"e
battery
terminals togethe'
and
the
positi\'e battei)· terminals together.
c.
When
connecting
a
charger
to the battery.
connect
the
charger
positive lead to the
battery
positiVI
terminal
and
the
charger
negative lead to the
battery
negati"
terminal.
d
"ever
operate
the
alternator
on
open circuit.
Make
absolutely
cenain
all connections
in
the circui
are secure
ISSl:ED:
8/18/72
3B21
ELECTRICAL
SYSTEI\<
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