Schumacher SE-1-12S Owner's Manual page 12

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 charger AC supply cord to 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.
6.9 See CALCULATING CHARGE TIME for length of charge
information.
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