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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.
Working at the first switch, attach the red wire. Connect the black wire to the terminals and finally do so with the white wire. Working from the second switch, find the 3-way switch and connect the red wire. Connect the white wire from the first switch to 1 of the terminals.