Re: Never ending supply of CD ignition systems that will replace Magnapower and other
Ok, I realize that a little more explaination may be in order. The MSD will replace the black CD unit box. If you trace all the wires from the old CD unit you will see they go to the following: Constant +, swtiched +, coil +, coil ground, and points on distributor. Pop on the MSD website and look at the wiring diagram for the points wiring schematic. They are exactly the same except that the MSD has an extra ground wire. You will not use the magnetic pickup wires and it even specifies that in the manual if you are using a points system. Both units do exactly the same thing, they send a high voltage pulse to the coil based off the points opening and closing. Make sure you ground the coil as it is on the old system. I removed the old CD unit, cut a board and mounted it to the same mounting studs.(1/2" exterior plywood should work) I screwed the coil bracket and new MSD unit to the board so that the top will still go on. You only need one MSD unit. It says it is for 4, 6, and 8 cylinders. This is for the rev limiter settings and if you leave it set for 8 cylinders, should not come into play as it will think the engine is spinning slower than it is and never cut out the ignition just like the old CD unit. (Running a two stroke 3 cylinder, I believe that if you set if for 6 cylinders, the rev limiter will actually work correctly, but being a boat with RPMs usually being controlled by the prop pitch, I was not concerned with over revving the engine) Besides having to make a mounting board, it truly is a simple install and should only take about 1/2 hour if you have some simple wiring skills. (soldering, crimping, etc.)
