Exploded View Of Alternator - Piper Navajo PA-31 Service Manual

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1 BRUSH HOLDER 4. STATOR
2. SLIP RING END HEAD 5. ROTOR
3 RECTIFIERS 6 DRIVE END HEAD
Figure 11-16. Exploded View of Alternator (Prestolite)
a. Turn to the "open" or maximum resistance position a 100-ohm variable
resistor having a wattage rating of 1-1/2 watts or above.
b. Connect this resistor with a voltmeter and three 12-volt batteries in series
to the relay as shown in Figure 11-15. Connect the negative battery post to the
relay base, and the positive battery post to the variable resistor.
c. Slowly decrease the resistance and observe the maximum voltmeter read-
ing obtained.
This reading will be the voltage at which the contacts open.
d. The contacts should open at 32-36 volts. If they do not, discard the relay.
11-25. ALTERNATOR AND COMPONENTS (PRESTOLITE).
11-26. DESCRIPTION OF ALTERNATOR. (Refer to Figure 11-16.) The prin-
cipal components of the alternator are the brush holder assembly (1), the slip
ring end head (2), the rectifiers (3), the stator (4), the rotor (5) and the drive
end head (6).
a. The brush and holder assembly contains two brushes, two brush springs,
a brush holder and insulators. Each brush is connected to a separate terminal
Revised: 11/15/82
ELECTRICAL
SYSTEM
PIPER NAVAJO SERVICE MANUAL
4B14