Which is battery terminal to be disconnected first?
The battery terminal to be disconnected first depends on the terminal that is earthed or attached to the car’s body.When a car is negatively earthed then it is prudent to take off the negative terminal first and connect it last.
What happens when you disconnect the negative terminal?
Since the negative terminal is almost always connected very solidly to the chassis, if you try to remove the positive terminal with a (conductive) wrench/spanner and the tool touches the chassis hundreds of amperes will flow, causing the wrench to get red hot.
Which is terminal to disconnect first, grounded or ungrounded?
Which terminal to disconnect first (the grounded one or the ungrounded one) is primarily a safety concern of the service technician. 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’s the best way to disconnect a car battery?
Disconnect the negative battery cable and then the positive cable with a combination wrench. Clean the battery posts and terminals with the post and terminal cleaning tool, so you have a good connection when you’re done.
The battery terminal to be disconnected first depends on the terminal that is earthed or attached to the car’s body.When a car is negatively earthed then it is prudent to take off the negative terminal first and connect it last.
Since the negative terminal is almost always connected very solidly to the chassis, if you try to remove the positive terminal with a (conductive) wrench/spanner and the tool touches the chassis hundreds of amperes will flow, causing the wrench to get red hot.
Clean any corrosion off of the battery and terminals with a can of spray-on battery cleaner. Disconnect the negative battery cable and then the positive cable with a combination wrench. Clean the battery posts and terminals with the post and terminal cleaning tool, so you have a good connection when you’re done.
Which terminal to disconnect first (the grounded one or the ungrounded one) is primarily a safety concern of the service technician. 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.