Piper SARATOGA PA-32-301 Maintenance Manual page 212

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
OVERVOLTAGE RELAY.
CHECKING OVERVOLTAGE RELAY.
The relay may be tested with the use of a good quality, accurate voltmeter, with a scale of at least 20-volts
and a suitable power supply, with an output of at least 20-volts, or sufficient batteries with a voltage divider to
regulate voltage. The test equipment may be connected by the following procedure:
1. B+ is connected to "Bat" of the overvoltage control.
2. B- is connected to the frame of the overvoltage control.
3. Be sure both connections are secure, and connected to a clean, bright surface.
4. Connect the positive lead of the voltmeter to the "Bat" terminal of the overvoltage control.
5. Connect the negative lead of the voltmeter to the frame of the overvoltage control.
6. The overvoltage control is set to operate between 16.2-volts to 17.3-volts. By adjusting the voltage, an
audible "click" may be heard when the relay operates.
7. If the overvoltage control does not operate between 16.2 and 17.3-volts, it must be replaced.
EXTERNAL POWER.
OPERATION OF EXTERNAL POWER RECEPTACLE.
The external power receptacle is located on the left side of the nose sectionjust aft of the engine cowling on
the PA-32-301 and on the right side behind the aft cabin bulkhead on the PA-32-301T. When using external
power for starting or operation of any of the airplane's equipment, the following procedure should be
followed:
Turn the master switch OFF and turn all electrical equipment OFF. Connect the RED lead of the PEP kit
jumper cable to the POSITIVE (+) terminal of an external 12-volt battery and the BLACK lead to the
NEGATIVE (-) terminal. Insert the plug of the jumper cable into the socket located on the fuselage. Note that
when the plug is inserted, the electrical system is ON. Proceed with the normal starting technique.
After the engine has started. reduce power to the lowest possible RPM, to reduce sparking. and
disconnect the jumper cable from the aircraft. Turn the master switch ON and check the alternator ammeter
for an indication of output. DO NOT ATTEMPT FLIGHT IF THERE IS NO INDICATION OF
ALTERNATOR OUTPUT. If aircraft battery is weak, charging current will be high. DO NOT TAKE OFF
until charging current falls below 20 amps.
- NOTE-
For all normal operations using the PEP jumper cables, the master
switch should be OFF, but it is possible to use the ships battery in
parallel by turning the master switch ON. This will give longer
cranking capabilities, but will not increase the amperage.
CA UTION: Care should be exercised because if the ships battery
has been depleted, the external power supply can be reduced to the
level of the ships battery. This can be tested by turning the master
switch ON momentarily while the starter is engaged. If cranking
speed increases, the ships battery is at a higher level than the external
power supply.
24-41-00
Page 24-47
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Revised: August 23, 1982
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