Connect positive first, negative having less potential wont 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.

Should positive terminal be connected first?

“Positive first, then negative. When disconnecting the cables from the old battery, disconnect the negative first, then the positive. When you are replacing your car battery, It isnt always easy to remember the order in which to disconnect and reconnect the terminals.

Do you connect the positive or negative first when jumping a car?

First the clamp of the red cable is connected to the positive terminal of the assisting vehicle. The other end of the red cable is connected to the positive terminal of the broken down vehicle. Then the black clamp is connected to the negative terminal of the assisting battery.

Can we connect positive terminal to positive terminal?

The source of electricity must have two terminals: a positive terminal and a negative terminal. The electrons will need to flow from the negative terminal to the positive terminal through a copper wire or some other conductor.

Can you just disconnect the positive terminal?

cosmic charlie said: You will be fine. Disconnecting either cable works. The reason they say to disconnect the negative and not the positive is because while taking the positive connection off with a wrench if you happen to touch anything with the wrench while its on the positive terminal it can arc and be dangerous.

Can I just disconnect positive terminal?

As long as you dont touch the battery positive terminal at the same time you will be OK and since the battery positive terminal usually has a red cover on it there is little risk.