Cessna 177 SERIES Service Manual

3
16-39.
TROUBLE
SHOOTING
THE ALTERNATOR
SYSTEM
(THRU 1977
MODELS)
(CONT.)
TROUBLE
PROBABLE
CAUSE
REMEDY
ALTERNATOR
SYSTEM
Regulator
faulty
or
improp-
2.
Stop
engine,
remove
cowl,
WILL
NOT
KEEP
BAT-
erly
adjusted.
(cont)
and
remove
cover
from
voltage
TERY
CHARGED.
(cont)
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.
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.
5. Check
resistance
from "F"
terminal
of regulator
to "F"
ter-
minal
of alternator.
Normal
indication is
a very low
resis-
tance. If reading
indicates
no,
or poor continuity, repair or
replace
wiring
from
regulator
to alternator.
6. Check resistance from "F"
terminal
of alternator
to alter-
nator case. Normal indication
is 6-7 ohms. If resistance is
high
or low,
repair
or replace
alternator.
7.
Check resistance
from case
of alternator
to airframe
ground.
Normal
indication
is
very
low
resistance.
If reading
indicates
no,
or poor
continuity,
repair
or
replace alternator
ground
wiring.
ALTERNATOR OVERCHARGES
Regulator
faulty or improperly
Check bus voltage
with engine run-
BATTERY
- BATTERY USES
adjusted,
ning.
Normal indication
agrees with
EXCESSIVE
WATER.
the Cessna
Alternator Charging
sys-
tem Service/Parts
Manual. Observe
ship's ammeter, ammeter should
indicate
near zero after
a few min-
utes
of engine
operation.
Replace
regulator.
Change
7
16-11

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)