Which battery terminal must be connected first and why?
Which battery terminal must be connected first and why?
Connect the positive terminal first, then the negative. This is to help avoid sparks at the battery, which could potentially ignite any hydrogen gas coming from the battery. When disconnecting the battery, disconnect the negative terminal first, then the positive.
Do you hook up red or black first?
Attach the red jumper cables first. Start by clamping one red cable to the positive side of the battery that won't start. Then attach the other red clamp to the positive side of the working battery. Next, clamp one black cable to the negative side of the working battery.
What happens if you hook up negative first?
If you first connect the negative cable, then when you connect the positive cable there is a chance the wrench will complete a circuit between the battery and the chassis of the car. This will at a minimum generate a spark, but that spark could eject molten metal toward you causing injury.
Why do you disconnect negative terminal first?
The reason they say to remove the negative first is because it is safer for you. The negative cable in all modern cars is attached to the chassis of the car. SO when you put your wrench on the negative post to loosen it, and the wrench hits the chassis, nothing happens.
Which terminal should be disconnected first from battery?
negative
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.
Should positive terminal be connected first?
Installing the new battery Before placing the new battery in position, ensure that both terminals and the cables are rust-free. ... Now connect the new battery in the reverse order, connecting the positive terminal first then the negative. Make sure that the battery is secured in place!
Why shouldn't you connect the negative terminal?
Why can't you connect the black jumper cable to the dead battery's negative (–) terminal? ... This is so you can avoid sparks from occurring near the battery where flammable hydrogen gas may be present, resulting in a possible explosion.
Does it matter which jumper cable you hook up first?
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.14 dic 2016