Some ignition coils do not require the ballast resistor, it is made with circuitry so that not only does it not require one it won't work if there is one in the circuit. They are usually clearly marked not to use a ballast resistor. The ones that require a ballast resistor usually aren't marked about it at all. If you are going to change the type of coil you must be sure it is compatable with the circuit you are placing it in. Way back Mallory had a high performance coil that was oddly shaped. Not only did it require a ballast resistor it also required an additional ballast resistor that was included with it. Be careful the type of coil you substitute. The Delorean has a solid-state ignition and could over-saturate a coil that wasn't designed to be used in such circuitry. You are always most safe using recommended parts, when you start experimenting you do so at your own risk. Using a coil that wasn't intended for the Delorean could damage the ECU module. David Teitelbaum vin 10757 --- In dmcnews@xxxx, dherv10@xxxx wrote: > Comment, I wouldn't suggest running any coil without a resistor, the car runs > on alternator voltage. It isn't 12 volts unless the car isn't running, it's > anywhere from 12.8 to 14.5 or 6 depending on your alternator and the load at > the time. The ballast will smooth out the voltage flow and control the > voltage/current going to the coil. Without a resistor wire coming off the > ignition switch like most car have, that feed the coil, you will