24 - 02 - 00
Page - 24 - 03
Reissued: August 1, 1986
1I2
CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Zcro output indicated on Open field winding in al- Disconnect field terminal of
ammeter regardless of rpm ternator. alternator from field wiring
(refer to alternator system and check for continuity
test procedure). (cont) from field terminal to ground
with ohmmeter (20-100
ohms) depending on brush
contact resistance.
—WARNING—
Turn magneto switch to OFF
before turning prop.
Pull propeller slowly by hand
turning alternator rotor
through 360° of travel.
If resistance is high, check
brushes for spring tension
and excessive wear and re-
place if necessary. If brushes
are okay and field reads
open, replace alternator.
Output indicated on am- Faulty voltage regulator. Start engine, turn on load
meter does not meet mini- (ref. alternator test pro-
mum values specified in al- cedure), set throttle at 2300
ternator system test pro- rpm. Check voltage at buss
cedure. bar (convenient check point,
remove cigar lighter and
check from center contact
(+) to ground (-). Voltage
should be l3.5-volts mini-
mum. If voltage is below this
value, replace regulator or
adjust to 14.0-volts using a
precision voltmeter con-
nected to bus.
Trouble Cause Remedy
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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