The Liberty Mutual Solutions site has step-by-step instructions on how to jump-start a car battery. You can find those instructions (and download a how-to PDF) in the related links below.
Here are some safety tips to remember when you jump-start your car battery:
-ALWAYS wear eye protection or eyeglasses when you jump-start a vehicle.
-ALWAYS make sure the cables will be clear of any moving engine parts when the cars are started.
-NEVER smoke while jump-starting a vehicle.
-ALWAYS start with the ignition in both vehicles turned OFF.
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