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Q: Removing bolt from red current line connected to the car's battery.

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I am trying to undo the bolt which is connecting the red current line of the vehicle's battery. I've disconnected the negative current line. The bolt is squared and I've been using an adjustable wrench in attempting to remove the bolt. The bolt slightly moves when I move it right or left but it's so close to the positive terminal and I'm only able to move it half an inch and don't have enough space to continue to turn the bolt. Is there a better tool I should be using? Does moving the wrench to the left loosen or tighten the bolt? Also this car is a "reconstructed" vehicle.
My car has an automatic transmission.

The square headed bolt is designed to keep the bolt from turning when you are trying to tighten or loosen the nut on the other side. To loosen the nut on the other side you will want to turn it to the left. There is a very old saying that uses the acronym "righty tighty, lefty loosey" that is usually a good rule of thumb. There are certain cases where things will have what are called reverse threads where this is not true and is in fact the opposite, but generally speaking, this is usually a good rule to remember.

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