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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
Secure the ends of the wires that go to the second outlet to the unused terminal pair on the first outlet and to either terminal pair on the second one. If the outlets are in the same box, make these connections with the 8-inch lengths of wire you extracted from cable sheathing.. Connect the black circuit wire to one of the bronze terminals on the first outlet. Some outlets have a self-locking hole behind each terminal into which you can push the end of the wire.