Cessna 182 1978 - Over-Voltage Warning System; Voltage Regulator;Alternator Control Unit

MODEL
182
& T182
SERIES
SERVICE
MANUAL
16-50.
OVER-VOLTAGE
WARNING
SYSTEM.
over-voltage
sensor.
If the
over-voltage
condition
was transient,
the
normal
alternator
charging
will
16-51.
DESCRIPTION.
The
over-voltage
warning
resume
and no
further
action
is necessary.
If the
system
consists
of
a sensor
switch
and
a red
warning
over-voltage
tripoff
recurs,
then
a
generating
system
light
labeled,
"HIGH-VOLTAGE",
on
the
instrument
malfunction
has
occurred
such
that
the
electrical
panel.
When
an
over-voltage
tripoff
occurs
the
over-
accessories
must
be
operated
from
the
aircraft
bat-
voltage
sensor
turns
off
the
alternator
system
and
tery
only.
Conservation
of electrical
energy
must
be
the red
warning
light
comes
on.
The
ammeter
will
practiced
until
the
flight
can
be
terminated.
The
over-
show
a discharge.
Turn
off
both
sections
of
the Mas-
voltage
light
filament
may
be tested
at any
time
by
ter Switch
to
recycle
the
over-voltage
sensor.
If
the
turning
off
the "Alternator"
portion
of the
master
over-voltage
condition
was
transient,
the normal
al-
switch
and
leaving
the battery
portion
on. This
test
ternator
charging
will
resume
and
no further
action
does
not
induce
an over-voltage
condition
on
the elec-
is
necessary.
If
the
over-voltage
tripout
recurs,
trical
system.
then
a generating
system
malfunction
has
occurred
such
that
the
electrical
accessories
must
be operated
If the
alternator
low
voltage
light
comes
on when
a
from
the
aircraft
battery
only.
Conservation
of
elec-
COM
radio
transmitter
is keyed
the
following
correc-
trical
energy
must
be
practiced
until
the
flight
can
be
tive
action
should
be followed.
terminated.
The
over-voltage
red
warning
light
fila-
a.
Inspect
COM
coax
connections
at
the
radios
and
ment
can
be
tested
by
turning
off
the
Alternator
por-
antennas
for
security
and
proper
installation.
tion
of the
Master
Switch
and
leaving
the
Battery
por-
Replace
as
required.
tion
turned
on.
This
test
does
not
induce
an
over-
b.
Ensure
the
COM
coax
shielding
is properly
voltage
condition
on
the
electrical
system.
grounded.
Beginning
with
1979
Models
the
over-voltage
sensor
c.
Inspect
routing
of
COM
coax
and
reroute
as
re-
is
contained
within
the
alternator
control
unit.
The
quired
to
provide
separation
from
the
alternator
unit
also
contains
a
low-voltage
sensor.
A red
warn-
wiring.
ing
light
labeled
"LOW
VOLTAGE"
is
installed
on
the
d.
Inspect
alternator
control
unit
connector
for
loose
instrument
panel.
When
an over-voltage
condition
or improperly
installed
contacts
and
replace
or
occurs
the over-voltage
sensor
turns
off
the alterna-
repair
as required.
tor
and
the
voltage
in
the
system
drops.
When
system
e.
Inspect
COM
coax
cables
for
damage
where
se-
voltage
drops
below
24.
8 volts
the
low-voltage
sensor
cured
with
ty-wraps.
Cables
that
have
been
crush-
turns
on
the
low-voltage
light
indicating
a drain
on the
ed or
deformed
should
be
replaced.
battery
and
the
ammeter
will
show
a discharge.
Turn
If the
above
inspection
does
not
correct
the
problem
a
off
both
sections
of the
master
switch
to
recycle
the
new
alternator
control
unit
may
be
installed.
2.
Voltage
Regulator
3. Screw
4. Housing
8. Wire
to Alternator
"A+"
9.
Wire to Over-voltage
Light
Detail
A
THRU
1977
MODELS
Figure 16-5.
Voltage Regulator/Alternator
Control Unit
(Sheet 1 of 4)
16-33