Which Battery Terminal Do I Take Off First. When disconnecting the cables from the old battery disconnect the negative first then the positive. Artie g Mar 27 2015.
Artie g Mar 27 2015. The negative cable in all modern cars is attached to the chassis of the car. Connect the new battery in the reverse order positive then.
SO when you put your wrench on the negative post to loosen it and the wrench hits the chassis noth.
Always remove the negative first to prevent arcing. Ground one off first and on last for safety against shorting. When removing the old battery remember to first disconnect the cables from the negative terminal which is usually black and has a minus - sign then disconnect the cables from the positive terminal which is usually red and has a plus sign. Unscrew the positive terminal.
