Mooney M20R - Battery Troubleshooting; Reserved

SERVICE
AND
MAINTENANCE
MANUAL
MZOR
MOONEY
AIRCRAFT
CORPORATION
-ALTERNATOR
TROUBLE
SHOOTIF1G
(con’t.)
TROUBLE
PROBABLE
CAUSE
REMEDY
Alternator
will
not
keep
battery
A
voltage
check
at
the
bus
shouM
indi-
charged.
(CON7.)
cate
a
reading
of 28.6
to
28.8
volts.
If
charge
rate
tapers
off
very
quickly
and
voltage
is
normal,
check
battery
for
mal-
function.
If ammeter
shows
a
low
charge
rate
or
any
discharge
rate,
and
voltage
is
low,
proceed
to
step
3.
Defective
wiring.
2.
Check
voltage
at
terminal
5,
with
An.Fld.
3
Master
switch
’ON".
Meter
should
indicate
bus
voltage.
If volt
age
is not
present,
check
wiring
between
regulator
and
bus.
Faulty
regulator.
3.
Remove
connector
from
regulator,
start
engine.
Momentarily
jump
pins
5 3
7
together
on
the
plug.
Aircraft
ammeter
should
show
hea~y
rate
of
charge.
If
heavy
charge
rate
Is
observed,
replace
regulator.
If
heavy
rate
is
not
observed,
proceed
to
step
5.
CAUTION
Pull
Alternator
Field
GIB.
Start
engine;
while
at
idle
RPM,
reset
GIB.
Slowly
increase
RPM
while
monitoring
bus
voltage.
DO
NOT
U(CEED
28
volts
Defective
wiring,
regulator
to
al-
4.
Check
resistance
from
FM
terminal
of
temator.
anemator
to
pin
7
of
reg.
plug.
Normal
indication
is
a
very
low
resistance.
If
reading
indicates
no,
or
poor
continuity
thigh
resistance),
repair
or
replace
wiring
from
regulator
to
alternator.
Defective
anemator.
5.
Check
resistance
from
case
to
field
of
attemator.
Normal
indication
is 3
4
ohms.
If
resistance
is
high
or
low,
repair
or
replace
altemator.
6.
Check
resistance
from
F2
terminal
of
altemator
to
anemator
case.
Normal
re-
sistance
is
high.
If
resistance
is
low,
re-
pair
or
replace
altemator.
243902
-RESERVED
243903
BATTERY
TROUBLE
SH0011NG
TROUBLE
PROBABLE
CAUSE
REMEDY
Discharged
battery.
Battery
wom
out.
Replace
battery.
Improper
charging
rate
setting.
Reset
charging
rate.
Excessive
discharging.
Turn
off
some
equipment
when
aLema-
tor
is
not
charging.
Decrease
starter
us-
age
by
using
extemal
power,
whenever
poss6le.
Standing
too
long.
Remove
and
recharge
battery.
Equipment
accidentally
left
on.
Remove
and
recharge
battery.
Impure
electrolyte.
Replace
battery.
Short
circuit
(ground)
in
wiring.
Check
wiring.
Low
charging
rate.
Adjust
voltage
regulator.
Cracked
cell
jars.
Loose
hold-down
bracket.
Replace
battery
and
secure
firmly.
Frozen
battery.
Replace
battery.
Compound
on
top
of
battery
melts.
Charging
rate
too
high.
Reduce
charging
rate
by
adjusting
vo~t-
age
regulator.
Electrolyte
runs
out
of
vent
plugs.
Too
much
water
added
to
bat
Drain
battery
and
keep
at
proper
level;
tery
and
charging
rate too
high.
adjust
voltage
regulator.
REV.10´•98
24-39-02
Island Enterprises