What happens if you disconnect the positive terminal first on a car battery?

The entire body of the car along with the engine is connected to the negative terminal of the battery. If you’re disconnecting the positive terminal first, and the spanner touches any part of body or engine, you’ll get a massive spark and potentially damage your battery also.

Which terminal do you connect first when replacing a car battery?

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 I disconnect the positive terminal first?

It’s important to disconnect the negative side of the battery first, otherwise you can cause an electrical short if the positive is removed first.

Why do you remove the negative terminal first?

If you’re disconnecting the positive terminal first, and the spanner touches any part of body or engine, you’ll get a massive spark and potentially damage your battery also. By disconnecting the negative first, you eliminate the risk of *grounding” your battery on the car body or engine.

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 car battery in wrong order?

Connecting them to the reverse polarities will result in major damage to the battery, and possibly other circuits and car electronics. However not connecting the cables properly may just mean there is insufficient contact between the terminals and the cables to allow the motor to crank.

Can You disconnect the positive terminal of a car battery?

You can disconnect the positive terminal of a car battery first as long as your tools do not bridge a connection between the positive terminal and any metal surface of the vehicle. Doing so will create a short since the negative terminal is grounded to the frame and fuses will pop, tools can melt, and the battery could explode.

What is the correct order to disconnect a car battery?

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.

How do you remove the battery cables from a car battery?

Your battery cables are attached to the terminals by a nut, so you’ll need to use a socket or adjustable wrench to loosen each nut. You should always remove the NEGATIVE terminal cable first. Then after unhooking the negative terminal and setting it aside, disconnect the positive terminal.

What happens if you disconnect a car battery wrong?

The common perception of disconnecting a battery wrong is that you will either burst into flames or fall to the ground in an electrocuted mush. The fact of the matter is if you disconnect the positive terminal first you don’t need to be too worried about safety.