... needs, you can use any packaging situation. ^ Use to jump dead batteries in cars, boats, snowmobiles, ATVs, and more.^ ... is suitable for both 12/24 volt systems.How to Start a Car With Jumper Cables Instructions: 1 Determine that ... fine and you may have a bad starter. A jump-start won't help if you have a bad starter. ... Turn on the dead car. If it doesn't start, you may have a poor connection at any of ...