Schumacher Automatic /Maintainer SP2 - Manual (Page 7)

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6.3 Check the polarity of the battery posts. The POSITIVE (POS, P, +)
battery post usually has a larger diameter than the NEGATIVE
(NEG, N, -) post.
6.4 Determine which post of the battery is grounded (connected) to
the chassis. If the negative post is grounded to the chassis (as in
most vehicles), see step 6.5. If the positive post is grounded to
the chassis, see step 6.6.
6.5 For a negative-grounded vehicle, connect the POSITIVE (RED)
clip from the battery charger to the POSITIVE (POS, P, +)
ungrounded post of the battery. Connect the NEGATIVE (BLACK)
clip to the vehicle chassis or engine block away from the battery.
Do not connect the clip to the carburetor, fuel lines or sheet-metal
body parts. Connect to a heavy gauge metal part of the frame or
engine block.
6.6 For a positive-grounded vehicle, connect the NEGATIVE (BLACK)
clip from the battery charger to the NEGATIVE (NEG, N, -)
ungrounded post of the battery. Connect the POSITIVE (RED)
clip to the vehicle chassis or engine block away from the battery.
Do not connect the clip to the carburetor, fuel lines or sheet-metal
body parts. Connect to a heavy gauge metal part of the frame or
engine block.
6.7 Connect charger AC supply cord to electrical outlet.
6.8 When disconnecting the charger, disconnect the AC cord, remove
the clip from the vehicle chassis and then remove the clip from
the battery terminal.
7. FOLLOW THESE STEPS WHEN BATTERY IS OUTSIDE VEHICLE.
A SPARK NEAR THE
BATTERY MAY CAUSE A
BATTERY EXPLOSION.
TO REDUCE THE RISK
OF A SPARK NEAR THE
BATTERY:
7.1 Check the polarity of the battery posts. The POSITIVE (POS, P, +)
battery post usually has a larger diameter than the NEGATIVE
(NEG, N, -) post.
7.2 Attach at least a 24-inch (61 cm) long 6-gauge (AWG) insulated
battery cable to the NEGATIVE (NEG, N, -) battery post.