I believe that coils that use a resistor in the circuit are made to run on about 8 volts. The resistor is bypassed when the car is starting and you get 12 volts going to an 8 volt coil and you get a very hot spark while starting. When the engine starts and the key moves to the run position, the coil then gets power from the resistor, which is stepped down to 8 volts. If you run the coil continuously on 12 volts, it will overheat and fail. FWIW Don -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://list.amc-list.com/pipermail/amc-list-amc-list.com/attachments/20100530/d0b638ae/attachment.htm> _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com