# Question: Do I Hook Up The Negative Or Positive First?

## Are car battery terminals always on the same side?

Is the positive battery terminal on the left or right.

No battery in it to use as reference.

Need to know which cable set is positive and negative.

Ground cable only goes to one side, but some cars that is on the negative terminal..

## Can you touch the positive terminal of a car battery?

It’s okay to touch both terminals of a car battery with your hands. The resistance in your body is so great that you barely complete a circuit, so you won’t feel a thing. … So just be real careful about what your wrench touches when removing the positive battery terminal. If you don’t touch metal, you’ll be fine.

## Do you take the red or black cable off first?

Step 10: Disconnect the black jumper cables first, then disconnect the red ones. Once the dead car is running, you may disconnect the jumper cables, starting with the black, negative cable clamps. Do not let the clamps touch each other while any part of the cables is still attached to a car.

## What happens if you jump a car the wrong way?

When you jump start your car the wrong way, there are many things that could possibly happen. The battery, jumper cables, and electronics will be damaged, including the fuse and the sensors. There is even a risk of explosion when the problem is at its worst.

## What happens if you connect two positive battery terminals together?

Just connecting the positive terminals together doesnt going to do anything. Since without the ground or negative terminal open the circuit is incomplete. 2 Circuit should be closed. If you connects only positive terminals and negative remains open then no current will flow as the circuit is open .

## Does negative or positive connect 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 do you connect 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.

## Do you connect positive to positive?

Connect to the positive cable to the positive terminal and the negative cable to the negative terminal of the good battery.

## How can you tell which wire is positive and negative when black?

If the multi-colored wire is black and red, the black wire is the negative wire, while the red one is positive. If both wires are black but one has a white stripe, the striped wire is negative, while the plain black wire is positive.

## What order do you reconnect a car battery?

Reconnecting the car battery – positive first Once you’re finished with the electrical work on your car, you can go ahead and replace the connectors back on to the terminals. Make sure you start the way you finished, reconnecting the positive terminal first and then the negative afterwards to prevent short circuits.

## What happens if you take the positive terminal first?

If positive terminal is removed first then chances of a spark are more if this terminal touches the body through the metal spanner or wrench you are opening with is grounded accidentally and may end in flames because lot of combustible material is around. And chances of this accidental touch are very high.

## Which wire do I connect first?

Ideally you would connect any ground cables first as that ensures that it is safe to move on and around the equipment ant that you can safely work on all parts, then connect the zero wire followed by the phases.

## Can a 24v battery kill you?

It is perhaps worth noting that 12/24V DC is just as deadly as 120/240V AC. There’s naught deadly in voltage, it’s the wattage that electrocutes you. A static shock is 6kV, as I recall, but the amperage is low enough that it doesn’t hurt at all.

## What happens if you connect the negative terminal first?

It is only a safety issue. 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. … If the battery is offgassing, the spark could ignite those gases causing an explosion.

## Why do you connect the negative cable to the engine block?

Since the entire engine block is grounded to the negative terminal, the cable need not be connected directly to the dead battery’s negative terminal, and in fact it would be unwise to do so as sparks from the connection (when the circuit is completed) could ignite the battery.

## What order do you hook up battery cables?

Car Battery Cable Order: Which to Connect FirstConnect Positive Cables First. Connect one positive or red cable end to the positive or red terminal on the dead battery. … Connect Good Negative. Attach the negative or black clamp to the negative terminal on the supply battery.Start the Supply Engine. … Connect Negative Cable to Ground. … Start the Car. … Disconnect Immediately.

## Why do you take off the negative battery cable first?

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.

## What happens if you connect positive to negative on a battery?

What happens if you accidentally interchange the positive and the negative clamps? A rapid spike in the electrical power from the donor battery will damage the dead battery and the vehicle’s electrical systems. … In extreme cases, the battery can crack, ignite, then explode.

## What happens when car battery cables are wrongly connected?

It is not common to damage the Engine Control Unit / Module by connecting the battery cables incorrectly. Most of them are designed to withstand reverse polarity. In the worst case, the ECU/ECM can be removed and inspected if a diode has failed.

## How do you tell positive and negative on a battery?

One is marked positive (+), the other negative (-). There are also positive and negative cables in the jumper cable set. The red one is positive (+), the black one is negative (-). Never connect the red cable to the negative battery terminal or a vehicle with a dead battery.

## What happens if you touch both car battery terminals?

Although a car battery has enough amperage (electrical power) to kill you, it doesn’t have enough voltage (electrical force — to push the electrons through your body) to do the job. … If you touch both terminals with a metal wrench, for instance, you can create a spark that can ignite hydrogen gas in the battery.

## When installing a battery which terminal goes first?

Attach the positive (red) cable first, following with the negative (black) cable. Hand-tighten the nuts. Do not over tighten the terminal bolts; the following values are recommended: SAE (tapered) automotive terminal: 50 to 70 inch-lb.

## Can reverse polarity damage electronics?

The bottom line is that reversed polarity at outlets is a shock hazard. Electronic equipment plugged in to an outlet with reversed polarity will still function, but that doesn’t mean it’s safe. … If you have outlets with reversed polarity, you should have the wiring repaired by an electrician.

## Do I connect positive to negative?

The positive (red) cable should be attached to the positive terminals on each battery. The negative (black) cable should have one end attached to the negative terminal of the dead battery, and one end grounded.