THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 3
Jun 1/03
2F21
24-00-00
CHART 1 (Sheet 2 of 4)
TROUBLESHOOTING ELECTRICAL SYSTEM
Trouble Cause Remedy
Zero output indicated on Open field winding Disconnect field terminal of
ammeter regardless of rpm. in alternator. alternator from field wiring
(continued) and check for continuity
from field terminal to
ground with ohmmeter
(20-100 ohms) depending
on brush contact
resistance.
CA
UTION: 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
replace if necessary. If
brushes are okay and field
reads open, replace
alternator.
Output indicated on Faulty voltage regulator. Start engine, turn on load
ammeter does not meet (ref. alternator test
minimum values specified procedure), set throttle at
in alternator system 2300 rpm. Check voltage
test procedure. at buss bar (remove cigar
lighter and check from
center contact (+) to ground
(-)). Voltage should be
27.5 volts minimum. If
voltage is below this value,
replace regulator.
High resistance connections Check visually for loose
in field or output circuit. binding posts at the various
junction points in system,
alternator battery post, lugs
. on ammeter, connections at
voltage regulator, circuit
breaker, etc. (See
schematic, Chapter 91.)
Examine crimped terminal
ends for signs of
deterioration at crimp or
strands of broken wire at
crimp. Tighten any loose
binding posts or replace
bad wire terminals.
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