Your vehicle depends on its battery to not only start the engine, but also to continuously provide energy for the ignition system during driving. If the battery's cranking amps are lower than the vehicle requires, not only will the vehicle fail to start, but it will also not benefit from a jump or recharge. Test the amperes of your car battery to avoid being stranded.
Remove the key from your car's ignition, if you have not done so already.
Disconnect the positive and negative cables from the terminals of your car's battery. Make sure that the cables are far enough away from the battery so that they do not accidentally make contact with the terminals
Connect the ampere meter to the terminals of your battery, starting with the positive terminal first, then the negative terminal.
Press "Test" on your ampere meter. Your ampere meter will show both Cold Cranking Amps and Cranking Amps. Compare the values from the meter against what the battery label shows. If the ampere meter shows a 10 percent or more decrease from what the battery specifies, you may need to replace your battery.
Remove the ampere meter from your battery in the opposite order from which you connected them. Reconnect your battery cables to the terminal posts, positive first, then negative.
