Cessna 182 1978 - Page 433

MODEL
182 &
T182 SERIES
SERVICE
MANUAL
16-41.
TROUBLE
SHOOTING
THE ALTERNATOR
SYSTEM
(BEGINNING WITH
1979 MODELS.)
(Cont.)
b. ENGINE
RUNNING
(Cont.)
TROUBLE
PROBABLE
CAUSE
REMEDY
ALTERNATOR
REGULA-
Shorted field in alternator.
Check
resistance from "F"
TOR CIRCUIT
BREAKER
terminal of alternator
to
OPENS
WHEN
BATTERY
alternator
case, if resis-
AND ALTERNATOR
tance is
less than 5 ohms
SWITCHES
ARE TURNED
repair/replace.
ON, LOW-VOLTAGE
LIGHT MAY
OR MAY
NOT
COME ON.
CAUTION
This
malfunction
may cause
a shorted
alternator
control
unit,
which
will result
in an over-voltage
condition when
system is
again operated.
ALTERNATOR
MAKES
Shorted diode
in alternator.
Turn
off Battery
Switch and
ABNORMAL
WHINING
remove
"B" Lead
from al-
NOISE.
ternator.
Check
resistance
from
"B"
Terminal
of
alter-
nator to alternator
case.
Re-
verse
leads and
check again.
Resistance
reading
may show
continuity
in one
direction but
should
show an
infinite reading
in the
other direction.
If an
infinite
reading is
not obtained
in one
direction,
repair
or
replace
alternator.
LOW-VOLTAGE
LIGHT
Shorted
alternator
control
Replace
alternator
control unit.
DOES NOT
GO OUT WHEN
unit.
ALTERNATOR
AND
BAT-
TERY
SWITCHES
ARE
Defective
low-voltage
Replace alternator
control
unit.
TURNED
ON.
sensor.
AFTER
ENGINE
START
Alternator
control
unit faulty
With
engine
not running
turn
WITH
ALL ELECTRICAL
or high resistance
in
field
off
all electrical
loads and
EQUIPMENT
TURNED
OFF
circuit
turn
on battery
and
alternator
CHARGE
RATE DOES
NOT
switches.
Measure bus
volt-
TAPER
OFF IN
1-3
age to ground.
then measure
MINUTES
voltage
from terminal
of
alternator to ground. If there
is more than
2 volts difference
check
field circuit
wiring
shown
in
alternator
system
wiring
diagram
in
Section
19.
Clean
all contacts.
Replace
components
until
there
is
less than
2 volts
difference between
bus voltage
and
field voltage.
NOTE
Also refer
to battery
power
system
trouble
shooting
chart.
16-27