Can I just disconnect positive terminal?

Disconnecting the neg terminal will be just as effective a method of isolating the battery. if your car if modern draws current even with it off. removing either ground or positive will stop the cars discharge, however a car battery with no load on it after a while will discharge. the answer, a battery maintainer.

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Also to know is, what happens if you disconnect the positive terminal first?

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.

which terminal should be disconnected first? You should always remove the negative battery terminal first, to reduce the risk of sparks which can make the car battery to explode. Once the negative terminal has been located, use the wrench to loosen the nut that holds the terminal.

Likewise, can you just disconnect the negative terminal?

When you are finished with the work on your vehicle, you will need to reattach the negative battery terminal to the battery. Disconnecting a negative battery terminal is an easy task, but you are working around a battery. Batteries contain acid and can cause injury if proper safety precautions are not taken.

Do I hook up the positive or negative first?

Safety: Always remove the negative cable first, then the positive cable. When you connect the battery, connect the positive end first.

Related Question Answers

Do I connect red or black first?

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 connect the negative terminal first?

The negative cable is connected to the body/chassis of the car. If you connect the negative first, then the positive, if you happen to touch the wrench to something metal while it is touching the positive terminal, that's a short - because the chassis is already connected to the negative battery terminal.

Does it matter which battery terminal I disconnect first?

Always work on the negative terminal before the positive when you disconnect your battery.

How long do you disconnect a car battery to reset computer?

How to Disconnect a Car Battery to Reset the Computer

1. Clean any corrosion off of the battery and terminals with a can of spray-on battery cleaner.
2. Hold the positive and negative cable ends together so they're touching each other but not the battery.
3. Wait five minutes for the diagnostic information to be erased.

Is it best to disconnect a car battery?

When you disconnect your car battery from the car, it helps prevent the electrical systems including the clock and on-board computer system from draining it completely. Therefore, if you leave the car battery unattended for longer period, then it might damage the battery and even need replacement.

Will disconnecting battery clear codes?

The battery disconnect method will work on most vehicles. Some late model vehicles will not clear trouble codes by disconnecting the battery. On these vehicles trouble codes are stored in the ECM's ROM, and only a scan tool will clear trouble code(s) and turn off the check engine or malfunction indicator lamp (MIL).

What happens if I disconnect my car battery?

Disconnecting your car battery will not cause any permanent damage to your computer or ECU (electronic control unit), but it can have some adverse effects. Those include canceling your preset radio stations, forgetting learned shift points, and your car's ideal fuel/air mixture.

How long can you leave car without starting?

There is no particular time span to keep an engine off. Modern cars doesn't have any issue in keeping idle. Car maintenance is the key fact. In my opinion warm up once at least every two weeks, if possible, start the car every two weeks and drive it for about 15 minutes.

How long does it take to reset car ECU?

In fact, to reset the ECU, you do need to let the car run at idle for at least 10 minutes. The engine needs to warm up, the idle needs to stabilize and the ECU itself has to collect all new data from all the sensors over a period of time to begin functioning again.

Can a battery drain with the negative cable disconnected?

Can any current flow out of battery if negative cable disconnected? A battery wouldn't drain to outside the battery without the negative post grounded. However, it can be a defective battery and not hold a charge, having been charged, and left overnite without either post hooked up.

Which battery cable should be removed first?

Always remove the negative cable first to avoid short circuiting the positive terminal. Once removed, disconnect the positive terminal using the same method and release the battery hold-down clamp with a wrench.

Does car battery drain if not used?

TRUE. Batteries have a natural self discharge or internal chemical leakage; and today's cars draw a tiny amount of power from the battery when not in use to keep all the electrical systems 'alive'. Over time, the battery will become fully discharged if not driven.

How do you reset your car's computer?

How to Reset a Car Computer

1. Open up the hood.
2. Remove the positive terminal cable from the battery using your pliers or wrench.
3. Go to your fuse box in your car, and look at the diagram. Select the fuse that is labeled "ECM" and remove this fuse.
4. Keep the car disconnected like this for two to three minutes to clear the computer's memory.

Which battery terminal do you 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.

Do I disconnect the positive or negative to check the 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, but it was never a good test. In the pre-computer days, you could pull it off without damaging anything. Today, you risk frying every electrical device in your vehicle.

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

How to avoid a flat car battery

1. Keep driving.
2. Switch off.
3. Ease the strain.
4. Check your battery.
5. Check other battery-related systems.
6. Service your car.
7. Know the warning signs.
8. Don't persevere.

Do you connect the positive or negative terminal first?

Spray both terminal ends with anti-corrosion solution. Attach and tighten the positive battery cable (Red). Attach and tighten the negative battery cable (Black). Ensure that all cable connections/ hold downs are properly tightened.

What happens if you remove 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.

Why don't you connect the negative when jumping a car?

Caution: Don't attach the negative cable to the negative terminal of the weak battery when jumping a car battery! This common mistake could ignite hydrogen gas directly over the battery. Battery explosions can cause serious injury. Finally, remove the positive cable from the car with the weak battery.