Schumacher Electric SE-1-12S Manual Del Usuario página 7

6.2 Stay clear of fan blades, belts, pulleys and other parts that can
cause injury.
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: You should disconnect both
battery cables from the battery before connecting the charger
cables. The output leads of the charger are terminated with 3/8"
(9.5 mm) dia. ring terminals. Remove the bolt from the battery
post connector, insert the bolt through the ring terminal then place
the bolt back in the battery connector and tighten. Connect the
POSITIVE (RED) ring terminal from the battery charger to the
POSITIVE (POS, P, +) ungrounded post of the battery. Connect
the NEGATIVE (BLACK) ring terminal to the vehicle chassis
or engine block away from the battery. Do not connect the ring
terminal 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 positive-grounded vehicle: You should disconnect both battery
cables from the battery before connecting the charger cables. The
output leads of the charger are terminated with 3/8" (9.5 mm) dia.
ring terminals. Remove the bolt from the battery post connector,
insert the bolt through the ring terminal then place the bolt back
in the battery connector and tighten. Connect the NEGATIVE
(BLACK) ring terminals from the battery charger to the NEGATIVE
(NEG, N, –) ungrounded post of the battery. Connect the
POSITIVE (RED) ring terminals to the vehicle chassis or engine
block away from the battery. Do not connect the ring terminals 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 the charger AC supply cord to the electrical outlet.
6.8 When disconnecting the charger, disconnect the AC cord, remove
the ring terminal from the vehicle chassis, and then remove the
ring terminal from the battery terminal.
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