ok so i have a 1975 Kawasaki g4tr 100 trail boss i have a problem with the wiring i have a wire coming from the magneto and there is a current but when i put it the the thing for he spark-plug there is no current coming out so i took the wire off and ut it rite to the spark-plug and there is no current going out of the plug to give a spark.do i need a cdi box or what?if you can give me any ideas of what it could be please let me know.