What happens if you disconnect the positive battery cable first?

Electrically it makes no difference which terminal you disconnect first as either one will remove power from all the electronics in the car. However, there is a safety issue if you plan to leave the battery in the car and only disconnect one terminal.

Why do you remove negative battery cable first?

If you’re disconnecting the positive terminal first, and the spanner touches any part of body or engine, you’ll get a massive spark and potentially damage your battery also. By disconnecting the negative first, you eliminate the risk of *grounding” your battery on the car body or engine.

Which battery terminal should be disconnected?

Originally Answered: Which terminal do you disconnect first on a car battery? It’s always best to disconnect the negative (black) cable first. Removing the red positive cable first and then accidentally hitting your car chassis’s with the wrench could cause it to short out the electrical system.

When jumping a car which cable goes on first?

How to jump-start a car steps:

1. Clamp the positive (red or yellow) cable to the positive terminal of the weak battery.
2. Clamp the other end of the positive cable to the positive terminal of the good battery.
3. Clamp the negative cable (black) to the negative terminal of the good battery.

Which cable do you connect first when jump starting a car?

The safest order to attach the jumper cables is as follows: Attach one red jumper cable clamp to the positive terminal on the dead battery. Attach the other end of the same cable, the second red jumper cable clamp, to the positive terminal on the working (live) car battery.

Do you take positive or negative off first?

When disconnecting the cables from the old battery, disconnect the negative first, then the positive. Connect the new battery in the reverse order, positive then negative.” When you are replacing your car battery, It isn’t always easy to remember the order in which to disconnect and reconnect the terminals.

Does it matter what order you put jumper cables on?

The negative (black) cable should have one end attached to the negative terminal of the dead battery, and one end grounded. The safest order to attach the jumper cables is as follows: Attach the other end of the same cable, the second red jumper cable clamp, to the positive terminal on the working (live) car battery.

Why do you connect the positive terminal first?

Connect positive first, negative having less potential won’t arc. The higher the voltage, the greater the chance of arcing and fusion. On a car if negative first and you are touching any metal part of car, when attaching positive there is possibility of arcing through you. Your body becomes part of the circuit.