Mooney M20B - General Electrical System Overview; Electrical System Troubleshooting

C-
SECTION
VIII
Ei;ECTRICAL
SYSTEM
k
GENERAL
The
~OON.fr
Al
20
2
uses
a
electrical
system.
A
fifty
amp,;;eavy
duty
generator
provides
plenty
of
current so
that,
even
if
a
high
electrical
load
is
plaLld
on
the
system
by
multiple
radios,
a
rotating
beacon,
and
navigational
lights,
the
heavy-duty
thirty-three
amp
battery
will
remain
at ~ull
charge.
The
battery
is
located
on
the
forward
left-hand
si;ie
of
the firewall. It
is
ciently
close
to the
engine,
so
that
there
is
very
little
fo~tage drop
and
more
electrical
power
is
available
for
cold
weather
starting..
The
br~aker
switches,
designed
to
relieve
the electrical
system
of
any
over-loads,
are
located
on
the
lower
right-hand
side
of
the
co-pilot’s
instrument
panel.
The
mr\ster
switch
control for
the
electrical
system
is
at
the
top
right-hand
side
of the
radio
instrument
panel.
Ei.
TRO’JBLESBOdilWG
Troubles
peculiar
tb
the
MOON~Y
M
208
electrical
system
are
listed
on
Figure
28
along
with
their
caus~
and
suggest~d
remedies. ~Vhen
troubleshooting,
check
from
the
power
supply
to
the item
affected.
If
no
trouble
is
found
by
this
~method,
the
trouble
probably
exists
inside
an
individual
piece
of
equipment
which
may
then be
removed
from the
airplane
and
an
identical
imit
or
units,
tested
and known
to
be
good,
installed
in
place.
I.
Electrical
Switches
and Circuit
Brenkers.
r
Electrical
switches
and
circuit
break~s,
located
in
the lower left
and lower
right
i~strument
panels,
control
the
navigation
and
instrument
lights,
landing Light,
electric
turn
and bank
indicator,
electric
fuel
pump,
and
other
electrical
compon-
ent~
The
circuit
breakers
automatically
break
the
electrical
circuit
if
an.overload
is
applied
to
the
system,
thus
preventing
damage
to
the
electrical
wiring.
To
reset
the circuit
breakers,
simply
push
in
the
buttons. Allow
sufficient
time
for
cooling
before
resetting
circuit
breakers.
The
time
for
´•resetting
circuit
breakers
may
vary
considerably,
depending
on
the
nature
of
the
overload
and
the
temperature.
2.
Battery.
.Tbe
battery
is
accessible when
the
left
side
cowl
is
removed
from
the
airplane.
The
battery
shcnrld
be
maintained
in
a
charged
condition
at
all
times
and
the
?Nater-
:evel
checked
at
regular
intervals.
A
fully
charged
battery
will
not
freeze
and
a
clean
battery
presents
no
hazard.
Never
add
anything
but
-distiUed
water,
to
the
battery.
Do
not overfill
as
the
water
and acid will
overflow
and
possibly
stain
the
belly
of
the
airplane.
A
hydrometer
check should
be
performed
to
determine
the
percent’of
charge
present
in
the
battery
(Refer
to Table
4).
All
connections
must
be clean
and
tight.
Ii
the
battery
is
not
up_
to
normal
charge,
recharge´•
starting
with
a
charging
rate
of
4
amperes
and
finishing
with
2
amperes.
Note:
&uick
charges
are
not recommended.
3.
´•Battery Charging
System
The
charging
current
of
the
battery
depends
upon
the
condition
of
the
battery
and
the
voltage
regulator
setting.
With
all
loads
turned off´•and
the
engine
--running
at
2000
RPM
or
higher,
the
normal
battery
charging
current
is
from
5
to
35
amperes.
Fe
OLDWILLWAYNE