thanks. Im running the Dyna's 3.0 coils. So copper it is...
In that case...you'll want to get some resistance in line with the coils, between the +12 volt supply and the coils. Otherwise, it won't be long before you overheat the Dyna S triggers, and your battery will run lower voltage than it does now. You can make your own from some 1 ohm, 10 watt resistors, or get one of my Resistor Packs (check my website, they are there).
Dyna has always recommended this resistance for use with those 3 ohm coils on these bikes, for several reasons. They just don't make 'em. Since the Dyna S adds about 1.25 amps extra load to the bike all by itself, and the 3 ohm coils add another 1 amp on top of that, you'll be heating up connectors all over the bike, too. the resistors will cool things off and make for a longer-duration spark, in the end.