Can You Just Disconnect The Negative Terminal?

How do I disconnect the negative battery terminal?

First, unbolt the negative battery cable and disconnect it by lifting it free.

It might take some wiggling and twisting to pull it off.

Be sure never to let the wrench touch both the negative and positive terminals at the same time..

Which terminal do you remove first on a battery?

Always remove the negative cable first. Use a wrench to loosen the nut on the black/negative (-) end of the battery. Detach the black/negative (-) cable from the battery. Detach the red/positive (+) cable from the battery.

Should a battery disconnect be on positive or negative?

The negative cable connects to the body ground already—so there’s no additional danger if it rubs. It’s the same principle as why you should always disconnect the battery’s negative side first before performing electrical service.

How long do you leave battery disconnected to reset ECU?

Disconnect both positive and negative cables from the battery, then touch positive and negative connectors for 30 seconds, that will do it.Log in.Full Site.Top.

Do I hook up the negative or positive 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.

Is it OK to just disconnect the negative terminal?

“If someone is going away for a few months over the winter, they should definitely disconnect the battery. It’s the only way to prevent battery drain,” Rashidi said. … I would recommend taking the negative battery post out, and wrapping something around the end so it doesn’t touch anything while you’re not there.”

What happens if you don’t disconnect the negative battery cable?

Never disconnect a battery cable when the engine is running. If the tool touches the battery positive terminal and a chassis ground simultaneously, as long as the negative battery cable is not connected, no damage will occur.

What terminal do you disconnect when working on a car?

Disconnect the Battery Cables The terminals will be marked positive and negative. Make sure you disconnect the negative terminal first. Lay the disconnected negative cable carefully to one side, making sure it’s well away from the battery terminal.

Which cable do you disconnect to check alternator?

If you’re tempted to test an alternator by disconnecting the negative battery cable, don’t do it. A good alternator may indeed keep the engine running without the negative cable, but this was never a good test. In the pre-computer days, you could pull it off without damaging anything.

Which battery terminal Do I disconnect for storage?

The low-tech solution is to disconnect the negative battery cable. You’ll likely lose the stereo presets, time and other settings. If you want to keep those settings and ensure that your battery starts the moment you return, purchase a battery tender, also known as a trickle charger.

Can I trickle charge a battery without disconnecting it?

Can I Leave the Battery Connected When the Trickle Charger is Plugged? If you are using a conditioning trickle charger, there is no need to disconnect the battery. However, if you should unplug the battery if you are using a full-power charger.

Can I just disconnect positive terminal?

Just be careful and ALWAYS disconnect the POSITIVE terminal first. Keep the battery grounded (negative is ground). Try not to touch the positive wire on metal as it possibly could be holding some charge after you disconnect it.

Which terminal do you disconnect first?

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.

Why do you have to disconnect the negative battery terminal first?

When a car is negatively earthed then it is prudent to take off the negative terminal first and connect it last. … The grounded terminal should be disconnected first to ensure that a battery dead-short does not occur, should the spanner disconnecting the other one contact a nearby grounded metal part.

What happens if you disconnect 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.

Do you hook up red or black first?

When you connect the cables, start with the positive/red one onto the positive battery cable and it will not spark. Now connect the negative cable (black one) to a piece of metal that is away from the battery, which means it is away from any hydrogen gas emitted by the battery.

Should I disconnect both battery terminals?

No, it won’t. You can disconnect whichever terminal you want, or even both, it won’t discharge. Whichever one you choose results in an open circuit so no current can possibly flow.

How do you keep a car battery from going flat when not in use?

If so, here are some things you can do to save your car battery when it’s not in use.1) Use a trickle charger or battery conditioner. … 2) Avoid turning your car on and then off again. … 3) Avoid short journeys. … 4) Drive your car for 15-20 minutes at a time. … 5) Alternate trips if your household has more than one vehicle.More items…