How To Know If Your Car Battery Is Charging. Your vehicle should be charged and ready to go. You may need to use jumper cables to get it started.
Attach a Voltmeter Youre now ready to use a voltmeter to gauge how much juice your battery has. 4 ways a battery can be charged. As the battery charges the needle will begin to descend gradually.
What you are looking for is a number higher than the initial battery voltage.
Make sure when charging a car battery to identify the positive and negative posts b. This is when a battery charger supplies DC power to a battery. Make sure you disconnect the negative lead first then the positive lead last. Your charging system should be supplying voltage between 140-145 in most cases sometimes higher but never over 165 volts.
