I have a 1972 Johnson 100ESL72R 100HP outboard motor. I do not understand this single coil/pulse pack system that they designed for this motor. It worked great for a couple of years but then I crossed up the battery cables one night while changing out a bad battery in the dark and that was the end of my ignition. This is one complicated system and I hate it. Can I replace the system with a more conventional system like you see on every other boat in the world? The price for one of these pulse pack is 300 bucks and that is just the beginning.