Piper Arrow IV Turbo Maintenance Manual page 203

INSPECTION.
Inspect the condition of the alternator components paying special attention to the condition of the slip rings
for indications of oil, being burnt or worn. Inspect brushes for signs of sticking in holder or shield and for
wear.
Inspect the bearing surface of the rotor shaft and the roller bearings at the rectifier end. Rotate the rotor in
the drive end shield to feel for roughness in the drive end bearing. Inspect the grease retainer. Inspect the
rectifier leads especially at connections for a good solder joint, also inspect insulation. Rectifier/stator lead
must be pushed down into the slots that are cast into the end shield and cemented with MoPar Cement
#2299314.
TESTING OF RECTIFIER ASSEMBLIES.
There are two methods of testing the rectifiers. These are the test lamp method and a method utilizing a
special Rectifier Tester Tool No. C-3829. The Rectifier Tester Tool method is preferred, as it provides a quick,
simple and accurate test of the alternator rectifiers without the necessity of disconnecting the stator phase leads
(Figure 24-7), however, both methods are described in this chapter.
The plastic cases surrounding the rectifiers are for protection
against corrosion and must not be broken. When performing
tests, always touch test probe to metal strap nearest rectifier.
TESTING OF POSITIVE RECTIFIERS USING C-3829 TESTER. (Refer to Figure 24-5.)
1. Place rectifier end shield and stator assembly on an insulated surface.
2. Plug tester C-3829 power source lead into a 110-volt A.C. power supply.
3. Connect the test lead "alligator" clip of Tester C-3829 to the alternator "BAT" terminal.
4. Touch the metal strap of each of the positive rectifiers with the test probe.
A. A reading on the tester of 1.75 amps or more indicates a satisfactory rectifier. The reading and
direction of needle movement must be the same for all three rectifiers.
B. When two rectifiers are good and one is shorted, the reading taken at the good rectifiers will be
low and the reading at the shorted rectifier will be zero. Disconnect the lead to the rectifier reading
zero and retest. With the defective rectifier disconnected, the reading of the good rectifiers will
now be within the satisfactory range.
C. When one rectifier is open, the tester will read approximately one amp while the two good rectifiers
will read within the satisfactory range.
Any tools called out by a "C" or "SP" number in this section may
be purchased from:
EFFECTIVITY:
CHRYSLER ALTERNATOR
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—CAUTION—
—NOTE—
Miller Special Tools
A Division of Utica Tool Company, Inc.
32612 Park Lane
Garden City, Michigan 48135
Phone: (313) 522-6717
1I11
24-32-06
Page 24-16
Revised: July 13, 1983