To test a car battery with a multimeter, set the multimeter to measure DC voltage, and set the dial to 20 volts; with the car off, disconnect the battery cables and attach the multimeter leads to the positive and negative posts on the battery. Wait for the reading.Know More
With the car turned off, follow the manufacturer's guidelines for removing the battery cables. Note which is red for positive and which is black for negative. Always use safety gloves and safety glasses when working on a car battery.
Turn on the multimeter and set to measure DC voltage. For a car battery, this is indicated by the letter V with a solid line on top of a dotted or dashed line above the letter. Set the dial to 20v.
The red lead is positive and is to be attached to the positive post on the battery, usually indicated by a plus sign next to it. The black lead is negative and is attached to the negative post on the battery, sometimes indicated by a negative sign next to it.
After a few seconds, the multimeter will display the voltage measured. The minimum desired reading for a working battery is 9.6 volts.
To hook up a car battery, put the new battery in the car, and hook up the positive and negative terminals. Make sure to refasten any kind of plate that held in the old battery. Dispose of the old battery at a battery recycling center.Full Answer >
To find the size of a car battery, check the car owner’s manual or use an in-store fit guide, recommends Consumer Reports. Alternatively, many auto battery retailers and manufacturers offer online battery sizing guides and battery finders to help consumers choose the right battery for their vehicles.Full Answer >
To recharge a car battery, clean the battery terminals, and connect a trickle charger to the terminals. Turn on the trickle charger, and allow the battery to charge overnight. Check that the battery is charged by turning on the vehicle.Full Answer >
To install a car battery, turn the engine off, and open the hood. Remove the old battery, and undo the wiring. Place the new battery on the platform, fix it in place with grips, and attach wires appropriately.Full Answer >