Piper Dakota Maintenance Manual page 185

GENERAL
This chapter contains instructions for correcting problems in the electrical system. It includes a general
description and function of each system part along with test and adjustments of various components.
DESCRIPTION AND OPERATION
The electrical system is a l4-volt, direct current, single wire, negative ground system. All electrical
equipment is grounded to metal airplane structure. A l2-volt battery is incorporated to furnish power for
starting and as a reserve power source in case of alternator failure. The battery and alternator are both
connected to a bus bar, from which all electrical equipment is powered, with the exeeption of the starter which
receives its power from the load side of the battery. The master switch controls battery relay and field circuit.
The master switch must be on for any electrical equipment to operate.
TROUBLESHOOTING
All checks and adjustments of alternator or components must be
made with engine stopped. Therefore, to complete some checks or
adjustments, it is necessary to remove these units and place them
on a test stand
Troubles peculiar to the electrical system are listed in chart 240l along with their probable causes and
remedies. Wiring diagrams included at the end of this section will give physical breakdown of diff e r e n t
electrical circuits.
After trouble has been corrected, check entire electrical system for security and operation.
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
—WARNING—
1H24
24 - 02 - 00
Page - 24 - 01
Reissued: August 1, 1986