Spark plugs have a pretty predictable life cycle, but ignition coils can be harder to track. Here's how to tell if an ...

By Ed Packer s.a.e. Quicker Starting Improved Economy Faster Acceleration Higher Speed Fig. 1. The layout of a typical six-cylinder, six-volt ignition syste ...

Just how does an ignition coil workto step up a battery's 12 volts (even less with a ballast resistor) to the tens of thousands of volts needed to fire the spark plugs?