A battery in a traditional car cannot directly create engine spark. It’s only rated at 12 volts, after all, so it needs a little help boosting the signal to the spark plugs. To make that happen, a car ...

An ignition coil takes voltage from the battery and multiplies it to create a spark at the spark plugs, which in turn ignites the engine. Cars have been using some form of the coil ignition system for ...

Last week, we showed you how to use a multimeter to measure voltage—or, more accurately, to verify that voltage is present—which is the most common reason you’d grab the meter and probe around in your ...