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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.
Connect 3 wire cable in the first switch box. The 3 wire cable enters through the top of the first switch box. The red insulated wire connects to either one of the 2 unused terminal screws (shown in the image above to be on the top left and right sides of both 3-way switches).