Piper ARCHER III Pilot Operating Handbook page 85

PA-28-181, ARCHER III
(d) Starting Engine With External Power Source
It is possible to use the ship's battery in parallel by turning
only the battery master switch ON. This will give longer
cranking capabilities, but will not increase the amperage.
Care should exercised if the ship's battery has been
depleted. The external power supply can be be reduced to
the level of the ship's battery. This can be tested by turning
only the battery master switch on momentarily while the
starter is engaged. If cranking speed increases, the ship's
battery is at a higher level than the external power supply. If
the battery is at a lower level than the external power
supply, continue starting with the battery master switch off.
Verify that the battery master, alternator switches are OFF, left
magneto switch is ON, and all electrical equipment is OFF. Connect
the RED lead of the PEP kit jumper cable to the POSITIVE ()
terminal of an external 24-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 turn ON the right magneto switch.
Disconnect the jumper cable from the aircraft. Turn the battery
master and alternator switches ON and check the alternator
ammeter for an indication of output. Check the oil pressure for a
positive indication. DO NOT ATTEMPT FLIGHT IF THERE IS
NO INDICATION OF ALTERNATOR OUTPUT.
ISSUED: JULY 12, 1995
REVISED: APRIL 15, 2002
NORMAL PROCEDURES
CAUTION:
SECTION 4
REPORT: VB-1611
4-19