Expert Reply: By removing the negative battery cable you are disconnecting the battery from the chassis of your vehicle. If you begin to remove the positive side before the negative and your wrench would make contact with any part of the vehicle, then you could cause a short in the system.
Besides, When a battery is disconnected earth lead should always be disconnected first?
Because the negative end of the battery is connected to ground. It is only a slight advantage to disconnecting the positive terminal. The reason for this is because while connected, any part of the chassis will complete the circuit and the chassis is one big wire that is easy to bump into.
Keeping this in mind, Should you remove positive or negative battery terminal 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.
Why is terminal first positive?
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.
What happens when you unplug the negative battery terminal?
If you remove the negative clamp and inadvertently complete a circuit to ground, there will be no current flow because the ground clamp is already grounded. Subsequent shorting of the positive terminal to ground will then produce no current flow because the current has no return path to the negative post.
Does power or ground connect first?
For technical functioning it does not matter in which order you connect them. However for safety reasons it does matter. The whole body of the car is usually connected to the minus pole. And you can accidentally hit that body with the positive lead.
Can you just disconnect the negative terminal?
In order to disconnect the battery, all you have to do is remove the cable from the negative port. Do not let the negative and positive cable ends touch under any circumstances.
Can a battery drain with the negative cable disconnected?
Be safe: always disconnect negative first. Disconnected either terminal will prevent drain, as stated already. A battery tender is another safe way to maintain the battery.
What happens if you remove the positive terminal first?
It can fall across either terminal and the car and nothing will happen. If you disconnect the positive terminal first and you drop a spanner, it is possible for it to fall across the positive terminal and any earth on the car, with spectacular and possible dangerous results.
Will unhooking battery reset the computer?
Does Disconnecting Battery Reset Check Engine Light? Yes, disconnecting the engine is one method of resetting your check engine light. … Other experts recommend turning on the light switch for a few minutes (the lights won’t come on) after disconnecting the engine to drain any remaining current on the computer.
What is the first step when removing the batteries for periodic maintenance?
Disconnect the cables, loosen the battery hold-down, use a battery strap to remove the battery.
Why is the red terminal first?
According to (IIRC) an old Haynes manual for an MG Midget, the true reason for connecting the reds first is that lead acid batteries produce hydrogen, and when you connect your jumper cables to the battery terminals there may be a spark in the event of a potential difference between the batteries (one of them is …
Why don’t you connect the negative when jumping a car?
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.
Why is the negative terminal connected to the body of the car?
The negative terminal in most vehicles is connected to the body so that fewer cables are required (one run from the positive to a device, then the device is connected to the body to complete the circuit instead of running a negative wire back to the battery).
Is it OK to just disconnect the negative terminal?
In order to disconnect the battery, all you have to do is remove the cable from the negative port. … If the cables do make contact or even get close, it could do a number of harmful things to your car, including frying your alternator, damage the cables, or worse, cause serious injury to yourself or others.
Will removing the negative battery cable reset computer?
Does Disconnecting Battery Reset Check Engine Light? Yes, disconnecting the engine is one method of resetting your check engine light. … Other experts recommend turning on the light switch for a few minutes (the lights won’t come on) after disconnecting the engine to drain any remaining current on the computer.
Can you just disconnect the negative terminal when working on car?
The negative battery terminal is your ground, which keeps you from getting shocked when working on the engines, the electrical, and the fuel parts of your car. Disconnecting this terminal is a safety precaution that will help keep you from feeling the full power that surges through your car.
Which electrical wire should be connected first?
When electrical wires are joined together the black wires must be hooked together, the white wires must be hooked to the white wires, and the ground wires must be hooked together. Otherwise, the circuit will not work, and will result in an electrical “short.”
Should you connect ground first?
In any electrical connection sequence you always connect the Ground first, the neutral then the hot.
Why do you connect ground 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.
What happens if I disconnect negative battery terminal?
If you remove the negative clamp and inadvertently complete a circuit to ground, there will be no current flow because the ground clamp is already grounded. Subsequent shorting of the positive terminal to ground will then produce no current flow because the current has no return path to the negative post.
Do you need to disconnect both battery terminals?
Disconnect the Battery Cables
The terminals will be marked positive and negative. Make sure you disconnect the negative terminal first. … While loosening the cables, be sure not to touch your wrench to both terminals at the same time, because this will allow electricity from the battery to flow through your wrench.
Which battery terminal should I disconnect?
Always work on the negative terminal before the positive when you disconnect your battery. Grab a socket from your socket kit and hold it near, but not against, the nut on the negative terminal of your battery. Ascertain visually the socket size you’ll need to loosen the nut.