Your engine refuses to turn over, and you have already replaced your battery. In this case, you may be in need of a new coil pack of ignition coils. The ignition coils in your engine work with the battery to create the necessary electric spark to ignite the fuel, and each engine cylinder typically requires its own ignition coil. With this being the case, an ignition coil pack is an economical solution for your needs. Before you purchase your coil pack, you will first need to determine which pack your vehicle requires, as the coil packs are different for each type of vehicle. For example, if you own a Ford, you will need to purchase a Ford coil pack. Once you know which coil pack you need, make sure to check out the inventory available on eBay. With a large selection of reliable sellers, eBay is sure to have the right coil pack for your vehicle.