THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 1
Jun 1/03
2F19
24-00-00
GENERAL
1. Description and Operation
The electrical system is a 28-volt, direct current, single wire, negative ground system. All electrical
equipment is grounded to the metal structure of the airplane; therefore, the structure takes the place of
the second wire. A 24-Volt battery is incorporated in the system to furnish power for starting and as a
reserve power source in case of alternator failure. With the exception of the starter, which receives its
power directly from the load side of the battery, the battery and alternator ( 90 Amp Electrosystem, Inc. )
are both connected to the bus bar, from which all electrical equipment is powered. The battery master
switch controls the battery relay. A radio master (i.e. - ground clearance) switch is installed as standard
equipment and provides a direct circuit to COMM1, speakers, and radio accessories when switched ON.
Otherwise, the battery master switch must be on before any electrical equipment will operate. The
airplane is equipped with standard navigation lights, anti collision lights, and a landing light mounted on
the nose landing gear.
2. Troubleshooting
WARNING: ALL CHECKS AND ADJUSTMENTS OF THE ALTERNATOR AND/OR ITS COMPONENTS
SHOULD BE MADE WITH THE ENGINE STOPPED. TO COMPLETE SOME CHECKS OR
ADJUSTMENTS, IT WILL BE NECESSARY TO REMOVE THESE UNITS FROM THE
AIRPLANE AND PLACE ON A TEST STAND.
Typical electrical system problems are listed in Chart 1 along with their probable causes and suggested
remedies. The electrical schematics included in Chapter 91 depict the different electrical circuits used in
the airplane.
After the trouble has been corrected, check the entire electrical system for security and operation of its
components.
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