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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.
Which battery terminal first. I am curious to which battery terminal should I take off first, positive or negative? When changing a battery I have always taken off the positive first followed by the negative, but when helping a neighbor with his car yesterday, he took off the negative cable to cut power to the electronics.