Cessna 182 1978 - Page 427

MODEL
182
& T182
SERIES
SERVICE
MANUAL
16-39.
TROUBLE
SHOOTING
THE
ALTERNATOR
SYSTEM
(Cont).
(THRU
1977
MODELS).
TROUBLE
PROBABLE
CAUSE
REMEDY
AMMETER
INDICATES
HEAVY
Shorted
diodes in
alternator.
4. Check
resistance
from
output
DISCHARGE
WITH
ENGINE
terminal
of alternator
to
alterna-
NOT
RUNNING
OR ALTERNA-
tor
case.
Reverse
leads
and
TOR
CIRCUIT
BREAKER
OPENS
check
again.
Resistance
reading
WHEN
MASTER
SWITCH
IS
may
show
continuity
in one
direc-
TURNED
ON.
(Cont.)
tion but
should
show
an infinite
reading
in the other
direction.
If an
infinite
reading
is
not ob-
tained
in at least one
direction,
repair
or
replace
alternator.
ALTERNATOR
SYSTEM
Regulator
faulty
or improp-
1.
Start engine
and adjust
for 1500
WILL NOT
KEEP BAT-
erly adjusted.
RPM.
Ammeter
should indicate
a
TERY CHARGED.
heavy
change
rate with all
electri-
cal
equipment
turned
off.
Rate
should
taper
off in
1-3 minutes.
A
voltage
check
at the
bus should
in-
dicate
a reading
consistant with
the
voltage
ex temperature
chart in the
Cessna
Alternator
Charging
System
Service/Parts
Manual.
If
charge
rate
tapers
off very
quickly
and
volt-
age
is normal,
check
battery
for
malfunction.
If ammeter
shows
a
low
charge
rate
or any
discharge
rate,
and voltage
is
low, proceed
to step 2.
2.
Stop engine,
remove cowl,
and remove cover from voltage
regulator. Turn master switch
ON/OFF
several
times and
ob-
serve field
relay in regulator.
Relay
should
open
and close
with
master
switch
and small
arc
should be seen
as contacts
open.
If relay
is inoperative,
proceed
to
step 3. If
relay operates,
proceed to step 4.
3. Check
voltage at "S"
terminal
of regulator
with
master
switch
closed. Meter
should indicate
bus
voltage.
If voltage
is present,
re-
place
regulator.
If voltage
is
not
present,
check wiring
between
regulator
and bus.
Before
performing
step
4, remove
radios from
panel.
4.
Remove
plug
from
regulator
and start engine.
Momentarily
jumper
the "A+"
and "F" termi-
nals
together
on
the plug.
Ship's
ammeter
should
show
heavy
rate
of
charge.
If
heavy
charge
rate
is
observed,
replace
regulator.
If heavy
charge
rate
is
not
ob-
served.
proceed
to step
5.
16-21