Quick Answer: Will disconnecting car battery harm computer?

Is disconnecting a car battery dangerous?

There’s also a remote possibility that shorting out the battery this way will damage your vehicle’s electrical system or engine-control computer. After you’ve removed the negative cable, push it far out of the way.

What happens if you 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.

Should I use a memory saver when changing car battery?

“A memory saver installed while making repairs provides an electrical path through the system and defeats the purpose of removing the battery. They may be okay to use for a simple battery replacement procedure but not during other repairs.”

Should I disconnect battery if car parked long term?

If you don’t have access to an outlet – say, in a long-term airport parking lot – your second option is to disconnect the battery. That’ll preserve the battery’s charge, so when you reconnect it, the truck should start right up.

How long do you leave battery disconnected to reset ECU?

Disconnecting the battery for a short time may not do the trick because the car’s computer, or ECU, still has some current in it. Waiting for over 15 minutes after disconnecting the engine will help ensure the equipment is reset.

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Can I just disconnect 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.

Is it OK to just disconnect the positive terminal?

You will be fine. Disconnecting either cable works. The reason they say to disconnect the negative and not the positive is because while taking the positive connection off with a wrench if you happen to touch anything with the wrench while it’s on the positive terminal it can arc and be dangerous.

What order do you reconnect a car battery?

“Positive first, then negative. 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.”

Why should you disconnect the negative terminal first?

The negative () cable is the ground cable; it is always connected to the frame or body metal and can safely be disconnected first with no chance of causing sparks.

Can a trickle charger be used as a memory saver?

No, it does not have a power supply mode. It has to sense a minimum voltage (whatever that may be) to stay on. If you connect it to the battery clamps or the OBD2 port or the cigarette lighter and disconnect the battery it’ll turn off.