Cessna 177 SERIES Service Manual

g16-39.
TROUBLE
SHOOTING
THE
ALTERNATOR
SYSTEM
(THRU
1977
MODELS)
(CONT.)
TROUBLE
PROBABLE
CAUSE
REMEDY
OVER-VOLTAGE
WARNING
Regulator
faulty
or improperly
1. With
engine
running
turn off
LIGHT
ON.
adjusted.
Faulty
sensor
switch.
and on
battery portion
of
the
master
switch.
If
the
light
stays
on
shut
down
engine
then
turn
on
the
"BAT"
and
"ALT"
portion
the
master
switch.
Check
for
voltage
at
the
"S"
terminal
of the
voltage
regulator.
If
voltage
is
present
adjust
or
replace
regula-
tor.
If voltage
is
not
present
check
master
switch
and
wiring
for
short
or
open
condition.
If
wiring
and
switch
are
normal
replace
sensor.
16-39A.
TROUBLE
SHOOTING
THE
ALTERNATOR
SYSTEM.
(BEGINNING
WITH
1978
MODELS)
a.
ENGINE
NOT
RUNNING.
TROUBLE
PROBABLE
CAUSE
REMEDY
AMMETER
INDICATES
HEAVY
Shorted
diode
in alternator.
Turn
off
Battery
Switch
and
re-
DISCHARGE
OR
ALTERNATOR
move
"B"
Lead
from
alternator.
CIRCUIT
BREAKER
OPENS.
Check
resistance
from
"B"
(Battery
Switch
ON,
Terminal
of
alternator
to alter-
Alternator
Switch
OFF,
nator
case.
Reverse
leads
and
all
other
electrical
check
again.
Resistance
reading
switches
OFF.)
may
show
continuity
in
one
direc-
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
REGULATOR
Short
in Over-Voltage
Disconnect
Over-Voltage
Sensor
CIRCUIT
BREAKER
OPENS
sensor.
plug
and
recheck.
If
circuit
WHEN
BATTERY
AND
breaker
stays
in replace
Over-
ALTERNATOR
SWITCHES
Voltage
Sensor.
ARE
TURNED
ON.
Short
in
alternator
voltage
Disconnect
regulator
plug
and
regulator.
recheck.
If
circuit
breaker
stays
in,
replace
regulator.
Short
in
alternator
field.
Disconnect
"F"
terminal
wire
and
recheck.
If circuit
breaker
stays
in,
replace
alternator.
16-12
Change
7

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)