Quote:
Originally Posted by ysidive
When disconnecting a battery Always disconnect the Negative First... Then the Positive.... When reconnecting the battery... Do the opposite...Positive Connected First Thenthe Negative... This should eliminate any sparking...
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The reason you do it this way is in case there is any metal of the vehicle that your wrench may hit. If there is no metal around, it doesn't matter which one you take off first. It's not going to reduce sparking unless your wrench hits something.