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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.
What is the correct way to disconnect a car battery? and then the correct way to connect it back? My dad and i have had many disputes about how you should take the negative battery terminal off first when taking the battery out or installing stereo system stuff, or to take the positive off first.