Mooney M20B - Page 71

:^?p;
If
the
charging
current
is
apparently
excessive,
note the
following;
a.
Charging
current
should
slowly
drop
to
10
amperes
or
less
after
-15
to
20
minutes
of
flight.
b.
A
very
low
battery
will
take
longer
to
show
a
drop
in
charging
c.Too
high
a
voltage
regulator
setting
will
cause
exce~sive
charging
and
ex-
cessi~e
loss
of
~vater
~easure
the
voltage
with
a
at
"Batt"
teminal
of
the
voltage regulator.
At
80"F,
the
voltp~e
should
be
13.8 to
14.8
volts.
This
voltage
will
be
higher
if the
temperatureis
less’than
80’F
and lower if
the
temperature
is
higher
than
80’F.
If
the
charging
is
apparently
low,
note
the
following:
a
The
charging
current
of
a
fullycharged
battery
is
normally
from
1
to’
4
ampheres.
b.
The
regulator
should
not
be
considered
defective
of
a´•low
charging
until:
1. A
voltmeter
check
indicates
that the
voltage~
ai;the
"Batt" terminal
is
below
requirements
given
in
Step
3C
above.
2.
A
hydrometer
check
of the
battery
indicates t-k.at
the
battery
is
not
fully charged,
~efer
to
Table
4
for
hydrometer
reading
Vs
Battery
Charge
Percent.
Table
4
Hydrometer~
Reading
vs.
Charge
Pefcent-
Hydrometer
Reading
Percent of
Charge
1280
100
1250
15
1220
50
1100
25
1160
Very
little useful
capa~ity
1130
or
belaw
I~ischatged
I
i´•’Based
on
battery
erectrotype
temperature
of
80"
P
Iii
batterjr
electrotype
temperature
is
below 80’
F,
subtract
4
points
for
every
H)"
F from
the
hydrometer readings.
If the
battery
acid
temperature
is above
above
80’
F,
add
4
points
for
every
10’
to
the
hydrometer
reading.
Example:
reading
1260
_~_
Battery
Electrolyte
Temperature
30’
F
Subtrac:
20
~eading
1230
C7-
~.I’´•´•
OLDWILLWAYNE