What Terminal Do You Disconnect First On A Car Battery. Electrically it doesnt matter but there is a good reason to disconnect the ground first then the positive and when reconnecting- to connect the positive first and then the ground This is because if you disconnect the negative first and you c. You can disconnect the positive terminal of a car battery first as long as your tools do not bridge a connection between the positive terminal and any metal surface of the vehicle.
Which battery terminal do you take off first. Always remove the negative terminal first when changing a car battery. Reassemble the connection using neutralizing felt pads under each terminal.
The size of the socket may vary by vehicle American cars will usually need a ½ 516 or 38 wrench while common sizes for imports are 10 and 12 mm.
If you can just connect the positive red alligator clamp to the positive terminal and the negative black alligator clamp from the charger to a metal ground on the car or the negative battery post and plug the OPTIMA charger in to an outlet it will eventually turn on automatically and do the rest. You can disconnect the positive terminal of a car battery first as long as your tools do not bridge a connection between the positive terminal and any metal surface of the vehicle. Then tighten the terminal nuts and spray on a liberal coating of anti-corrosive spray. The grounded terminal should be disconnected first to ensure that a battery dead-short does not occur should the spanner disconnecting the other one contact a nearby grounded metal part.
