Piper SARATOGA PA-32-301 Maintenance Manual page 166

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
GENERAL.
This chapter contains instructions for correcting difficulties which may arise in the operation of the
electrical system. It includes a general description and function of each part of the system along with test and
adjustments of the various components.
DESCRIPTION AND OPERATION.
The electrical system is a 14-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 12-volt battery is incorporated in the system to furnish power for starting and as a reserve
power source in case of alternator failure. The battery and alternator are both connected to the bus bar. from
which all electrical equipment is powered, with the exception of the starter which receives its power from the
load side of the battery. The master switch controls the battery relay and field circuit. The master switch must
be on before any electrical equipment will operate. The airplane can be equipped with standard navigation
lights, rotating beacon and one landing light located in the nose cowl.
TROUBLESHOOTING.
Troubles peculiar to the electrical system are listed in Chart 2401 along with their probable causes and
suggested remedies. The wiring diagrams included at the end of this section will give physical breakdown of the
different electrical circuits used in this airplane.
After the trouble has been corrected, check the entire electrical system for security and operation of its
components.
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WARNING
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All checks and adjustments of the alternator and/or its components
should be made with the engine stopped. Therefore, to complete
some checks or adjustments, it will be necessary to remove these
units from the airplane and place on a test stand.
24-02-00
Page 24-01
Issued: January 2, 1980
1G22