If you put a new battery in your car does it matter which terminal gets hooked up first?
It does matter. If the positive terminal of the new battery is connected first, the battery may come into contact with the metal of the car's body and cause a spark or even an explosion. This is because the positive terminal of the battery is connected to the car's electrical system, which is live. If the negative terminal of the new battery is connected first, this creates a circuit that allows the electricity to flow from the battery to the car's electrical system without any risk of a spark or explosion. For this reason, it is always important to connect the negative terminal of the new battery first, followed by the positive terminal.