Piper Cherokee Six - Page 577

371
END
VIEW
SIDE
VIEW
Figure
10-24m.
Brush
Installation
Figure
10-24n.
Internal
Wiring
Schematic
10-271.
CHECKING
ALTERNATOR
BELT
TENSION.
If
properly
installed,
tensioned
and
checked
periodically.
the
alternator
drive
belt
will
give
very
satisfactory
service.
However,
an
improperly
tensioned
belt
will
wear
rapidly
and
may
slip
and
reduce
alternator
output.
Consequently.
a belt
should
be
checked
for
proper
tension
at
the
time
it
is
installed.
again
after
25
hours
operation
and
at
each
100
hour
inspection
thereafter.(Referto
Paragraph
10-32.)
For
aircraft
with
airconditioning
installed
refer
to
Paragraph
13-22
&
13-23
for
alternator
belt
tensions.
10-28.
VOLTAGE
REGULATOR.
10-29.
CHECKING
VOLTAGE
REGULATOR.
The
regulator
is
a
fully
transistonzed
unit
in
which
all
of
the
components
are
encapsulated
in
epoxy,
which
makes
field
repair
of
the
unit
impractical,
and
if
it
does
not
meet
the
specifications,
it
must
be
replaced.
The
regulator
may
be
tested
by
the
following
procedure:
a.
Be
sure
that
the
battery
is
fully
charged
and
in
good
condition.
b.
Check
the
alternator
according
to
the
manufacturer's
instructions,
to
determine
if
it
is
functioning
properly.
This
test
must
be
done
with
the
regulator
out
of
the
circuit.
After
completing
this
test,
reconnect
the
regulator
into
the
circuit.
c.
Use
a
good
quality
accurate
voltmeter
with
at
least
a 15
volt
scale.
d.
Connect
the
positive
voltmeter
lead
to
the
red
wire
at
the
regulator
harness
connector,
or
terminal
block.
Connect
the
negative
voltmeter
lead
to
the
regulator
housing.
(Note)
Do
not
connect
the
voltmeter
across
the
battery,
because
the
regulator
is
designed
to
compensate
for
resistance
contained
within
the
wiring
harness.
e.
With
the
alternator
turning
at
sufficient
rpm
to
produce
a
half
load
condition,
or
approximately
25
amperes
output,
the
voltmeter
should
read
between
13.6
and
14.6
volts.
The
ambient
temperatures
surrounding
the
voltage
regulator
should
be
between
50
F.
to
100
°
F.
while
this
test
is
being
made.
ELECTRICAL
SYSTEM
Revised:
8/14/73
PIPER
CHEROKEE
SIX
SERVICE
MANUAL
3C1