Piper SARATOGA PA-32-301 Maintenance Manual page 168

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Trouble
Cause
Remedy
Zero output indicated on
ammeter regardless of RPM
(refer to alternator system
test procedure) (cont)
Open field winding in al-
ternator.
Disconnect field terminal of
alternator from field wiring
and check for continuity
from field terminal to ground
with ohmmeter (20-100
ohms) depending on brush
contact resistance.
- CAUTION -
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-
meter does not meet mini-
mum values specified in al-
ternator system test pro-
cedure.
Faulty voltage regulator.
Start engine. turn on load
(ref. alternator test pro-
cedure). set throttle at 2300
RPM. Check voltage at buss
bar (convenient check point.
remove cigar lighter and
check from center contact
(+) to ground (-). Voltage
should be 13.5-volts mini-
mum. If voltage is below this
value, replace regulator.
24-02-00
Page 24-03
Issued: January 2, 1980
1G24