Piper COMANCHE PA-24-180 Service Manual page 577

PIPER COMANCHE SERVICE MANUAL
FIGURE 9-27P. REGULATOR DIAGRAM
ating
k.
1.
Capacitor,
batteryless.
Neon lamp.
Control P1
Cl, is used to filter ripple and alternator diode switching spike when oper-
LI. provides transient voltage orotection acting as a surge suppressor.
is used to provide a limited range oi voltage adjustment.
9-61p. Preparation For Testing.
CAUTION
Do Not Interchange Regulator Leads. This will destroy
regulator
and void warranty.
a. The aircraft technician or other electrical
systems specialist. must disconnect :he battery
before connecting
or disconnecting a test ammeter or other test
equipment or before making
winng chages in the electrical system.
b. When a voltmeter only is to be used for circuit
testing, the battery need not be discon-
nected, provided caution is used when connecting
or disconnecting the voltmeter.
c. When installing a battery in an aircraft. be sure that the battery negative terminal is :n a
position so that this terminal can be connected
to the battery ground cable for negative
ground
systems.
d. The regulator, when installed
in an aircraft. should be mounted on a metal area. and in a
place where it will not be subjected to excessive
temperature.
e. To insure a good regulator ground. a permanent ground lead should be connected
between
the regulator mounting bolt and the alternator frame.
f. The alternator does not need to be polanzed; therefore, never connect ground. even mo-
mentarily, to either the regulator field terminal or to the alternator field terminals. Do not inter-
change I and F leads to regulator as this will destroy the regulator.
ELECTRICAL SYSTEM
iSSUED: 8/18/72
3 C7