Cessna 182 1978 - Page 430

MODEL 182
& T182 SERIES SERVICE
MANUAL
16-40. TROUBLE SHOOTING.
THE ALTERNATOR SYSTEM.
(THRU 1978 MODELS.) (Cont.)
b. ENGINE
RUNNING
(Cont.)
TROUBLE PROBABLE CAUSE REMEDY
ALTERNATOR REGULATOR
Shorted field in alternator.
Check resistance from "F"
CIRCUIT BREAKER OPENS terminal of alternator to
WHEN BATTERY AND
alternator case, if resistance
ALTERNATOR
SWITCHES
is less than 5 ohms repair/
ARE
TURNED ON, OVER-
replace.
VOLTAGE LIGHT DOES
NOT COME ON.
This malfunction frequently causes a shorted regulator 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
NOISE alternator. Check reisitance
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 at
least one
direction,
repair
or replace alternator.
OVER-VOLTAGE LIGHT DOES Shorted regulator Replace regulator
NOT GO OUT WHEN ALTER-
NATOR AND BATTERY
SWITCHES ARE TURNED ON. Defective over-voltage Replace sensor.
sensor.
AFTER ENGINE START Regulator faulty or high With engine not running turn
WITH ALL ELECTRICAL
resistance in field circuit.
off all electrical loads and
EQUIPMENT TURNED OFF
turn on battery
and alternator
CHARGE
RATE DOES NOT
switches. Measure
bue voltage
TAPER OFF IN 1-3 MINUTES
to ground,
then measure voltage
from terminal
of alternator
to
ground. If there is more than
2 volts difference check field
circuit wiring shown on alter-
nator system wiring diagram in
Section 20. Clean all contacts.
Replace components until there
is less than 2 volts difference
between bus voltage and field
NOTE voltage.
Also refer to battery power system trouble shooting chart.
16-24