i have this motor that will get spark on one cylinder and not on the other. i noticed one the one that does not spark that it has a wire that leads to the end of the wire harness into the plug that plugs into the control box or goes to front of boat. i do not have what plugs into that plug. could this be the reason im not getting spark on that cylinder. could someone tell me how to resolve this unless its just a coil that needs replaced. i just need to know how to start this old motor without being plugged up. thank you all!