Schumacher Automatic /Maintainer SP2 - Manual (Page 8)

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7.3 Connect the POSITIVE (RED) charger clip to the POSITIVE
(POS, P, +) post of the battery.
7.4 Position yourself and the free end of the cable you previously
attached to the NEGATIVE (NEG, N, -) battery post as far away
from the battery as possible – then connect the NEGATIVE
(BLACK) charger clip to the free end of the cable.
7.5 Do not face the battery when making the final connection.
7.6 Connect charger AC supply cord to electrical outlet.
7.7 When disconnecting the charger, always do so in the reverse
order of the connecting procedure and break the first connection
while as far away from the battery as practical.
7.8 A marine (boat) battery must be removed and charged on shore.
To charge it onboard requires equipment specially designed for
marine use.
8. GROUNDING AND AC POWER CORD CONNECTIONS
RISK OF ELECTRIC SHOCK OR FIRE.
8.1 This battery charger is for use on
a nominal 120-volt circuit. The plug must
be plugged into an outlet that is properly
installed and grounded in accordance
with all local codes and ordinances. The
plug pins must fit the receptacle (outlet). Do not use with an
ungrounded system.
8.2 Never alter the AC cord or plug provided – if it
does not fit the outlet, have a proper grounded outlet installed by
a qualified electrician. An improper connection can result in a risk
of an electric shock or electrocution. NOTE: Pursuant to
Canadian Regulations, use of an adapter plug is not allowed in
Canada. Use of an adapter plug in the United States is not
recommended and should not be used.
8.3 Recommended minimum AWG size for extension cord:
• 100 feet (30.5 meters) long or less – use an 18 gauge (0.82 mm 2 )
extension cord.
• Over 100 feet (30.5 meters) long – use a 16 gauge (1.31 mm 2 )
extension cord.