SERVICE PRECAUTIONS.
Since the alternator and regulator are designed for use on only one polarity system, the following
precautions must be observed when testing or servicing the electrical system. Failure to observe these
precautions will result in serious damage to the electrical equipment.
1. Disconnect the battery before connecting or disconnecting test instruments (except voltmeter) or
before removing or replacing any unit or wiring. Accidental grounding or shorting at the regulator, alternator,
ammeter or accessories, will cause severe damage to the units and/or wiring.
2. The alternator must not be operated on open circuit with the rotor winding energized.
3. Do not attempt to polarize the alternator. No polarization is required. Any attempt to do so may result
in damage to the alternator, regulator or circuits.
4. Grounding of the alternator output terminal may damage the alternator and/or circuit and components.
5. Reversed battery connections may damage the rectifiers, wiring or other components of the charging
system. Battery polarity should be checked with a voltmeter before connecting the battery. Most aircraft are
negative ground.
6. If a booster battery or fast charger is used, its polarity must be connected correctly to prevent damage
to the electrical system components.
OVERHAUL OF ALTERNATOR.
When repairing the alternator, complete disassembly may not be required. In some cases it will only be
necessary to perform those operations which are required to effect the repair. However, in this section, the
complete overhaul is covered step-by-step to provide detailed information on each operation. In actual service
practice, these operations may be used as required.
Figure 24-1. Lamp-Bank Load
24-31-03
Page 24-13
Added: August 17, 1982
1I8
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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