Always disconnect the negative terminal first . If you disconnect either terminal, then the system will be safe. However if you are disconnecting or connecting the positive terminal and touch your tool to the chassis you can cause a short and a spark which can cause the battery to explode.
Which battery cable should you disconnect when working on a vehicle?
“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.”
Is it OK to just disconnect the negative terminal?
In order to disconnect the battery, all you have to do is remove the cable from the negative port. … If the cables do make contact or even get close, it could do a number of harmful things to your car, including frying your alternator, damage the cables, or worse, cause serious injury to yourself or others.
When should I disconnect car battery?
If you plan on storing a vehicle for an extended period, it’s advisable to disconnect at least the negative terminal from your car battery. This prevents unnecessary battery drain, as a fully charged battery can hold its charge for 6-12 months if you do this.
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.
Do you have to disconnect both battery terminals when working on a car?
You don’t need to disconnect both of them, one will suffice. And whenever you’re back, just connect it again. Chances are, your battery might still have some current left to start your vehicle and when your vehicle will run, it’ll recharge again.
Should a battery spark when disconnecting?
Yes, a battery should spark when connecting it. … As long as your battery is dead or unconnected, the light won’t get what it’s looking for. The second that your battery is connected, your light can suddenly get the electricity it’s been asking for, so a little spark will occur.
How long will a car battery stay charged if disconnected?
When stored properly out of the car in a secure place, a detached car battery has the chance to last up to six months. Just like any other car battery, it will need charging, but not as often as if it were attached. Giving the battery a charge around every 12 weeks is a good rule of thumb.
How do you keep a battery charged when not driving?
How to Keep a Car Battery Charged When Not in Use
- Disable Parasitic Drains. If you’re planning on parking in your garage, you can disable your vehicle’s security system. …
- Use a Battery Maintainer. …
- Disconnect the Negative Battery Cable. …
- Remove the Battery Entirely.
Is a disconnected battery still doing work?
Disconnected, it’s good for three or four weeks. The reason the negative cable should be removed instead of the positive is that if you accidentally touch the car body or anything else metal under the hood, nothing will happen – the car body is connected to the negative terminal.