THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 7
Jun 1/03
2G7
24-30-00
(h) If voltage fails to increase a minimum of 0.5 volt, position alternator switch to OFF. An
under voltage condition exists. Proceed as follows to isolate problem.
1 Disconnect regulator plug and install a jumper from positive terminal of battery to pin
2 (F pin of regulator plug).
CAUTION: DO NOT OPERATE ENGINE MORE THAN 2 MINUTES WITH
JUMPER INSTALLED. DAMAGE TO COMPONENTS OF ELECTRICAL
SYSTEM COULD OCCUR.
2 Start engine. Turn ALTR switch ON. Apply electrical load by turning landing light ON.
Slowly increase engine speed to determine that voltage recorded in step (b), above,
increases. Stop rpm increase when voltage measures 0 volts.
3 Voltage reading at battery should increase above previous reading a minimum of 0.5.
4 Turn landing light OFF. Turn ALTR switch OFF. Shut down engine. If the increase in
voltage reading is still less than 0.5 volt, the problem is in the wiring harness or
alternator.
5 To isolate the wiring harness, remove jumper end from the voltage regulator plug and
connect it to the FLD pin of the alternator (plug removed).
6
Leave alternator regulator plug disconnected.
7
Start engine. Turn ALTR switch ON. Apply electrical load by turning landing light ON.
Slowly increase engine speed to determine that voltage recorded in step (b), above,
increases. Stop rpm increase when voltage measures 0.0 volts. Observe two (2)
minute operation CAUTION, above.
a If the voltage increase is now a minimum 0.5 volt, fault is wiring harness. Repair
or replace harness.
b
If the voltage increase is still below 0.5 volt, fault is in alternator. Remove
alternator from aircraft for bench test.
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