Wiring a Coil with External Resistor the Right Way
If you're tinkering with an older engine, you've probably come across a coil with external resistor and wondered why the heck it's even there. It seems like an extra step, right? You've got a battery, you've got a coil, so why shove a little ceramic block in the middle of the circuit? It turns out that little block—usually called a ballast resistor—is actually doing a massive favor for your ignition system's longevity. Without it, you'd likely be replacing your coil or your points way more often than you'd like. ...