Cessna 182 1978 - Page 431

MODEL
182 &
T182
SERIES
SERVICE
MANUAL
16-40,
TROUBLE
SHOOTING
THE
ALTERNATOR
SYSYEM.
(THRU
1978
MODELS.
) (Cont.)
b. ENGINE
RUNNING
(Cont.)
TROUBLE
PROBABLE
CAUSE
REMEDY
ALTERNATOR
SYSTEM
WILL
Alternator
output
voltage
1.
Connect
coltmeter
between
NOT
KEEP
BATTERY
insufficient.
D.C.
Bus
and ground.
Turn
off
CHARGED.
all
electrical
loads.
Turn on
Battery
Switch.
Start
engine
and
adjust
for 1500
RPM,
voltage
should
read
approximately
24
volts.
Turn on
alternator
switch,
voltage
should read
between 27.4
and
28.0
volts.
Ammeter
should
indicate
a heavy
charge
rate
which
should
taper
off in
1-3 minutes.
If
charge
rate tapers
off
very quick-
ly and
voltage
is normal,
check
battery for malfunction.
If am-
meter
shows
a
low charge
rate
or
any
discharge
rate,
and
voltage
does
not rise
when alternator
switch
is turned
on proceed to
step 2.
2.
Stop
engine,
turn
off
all
switches. Connect
voltmeter
between
"F"
terminal
of
alternator
and ground..
Do
NOT start engine. Turn on
battery
switch and
alternator
switch.
Battery voltage
should
be present
at "F"
terminal,
less
1 volt drop
thru regulator,
if not
refer
to step 3.
3.
Starting at
"F" terminal
of alternator
trace
circuit
to voltage
regulator, at
"B"
terminal
of regulator
trace
circuit to over-voltage sensor,
to
master switch,
to bus bar.
Replace component
which
does
not have voltage present at
output.
Refer to
alternator
system
wiring
diagram
in
Section 20.
Alternator
field winding
1. If voltage
is present turn
off
open.
alternator
and battery
switches.
Check resistance
from
"F"
terminal
of alternator
to alter-
nator case, turning alternator
shaft
during measurement.
Normal
indication is
12-20 ohms.
If
resistance
is high
or low,
repair or replace
alternator,
If
OK
refer to
Step 2.
16-25