Marc0

Hi I have Dyna S ignition and Dyna 3 ohm coils I have a voltage drop (2v) going to coils and very weak spark It still runs but cuts out at higher revs in 3rd 4th and 5th I have checked the earths and fuse connections and kill and key switch All OK When I unplug Dyna S ignition I dont get a drop in voltage Any ideas?? thanks