I have aquired an older Johnson that I need to get parts for, but I'm having trouble finding out the year it was manufactured. It is a 33 hp Super Seahorse. Mod. 15S, Ser.# J2771883. I also need info on what type of battery charging system was used on this model. Above the starter ring on the fly wheel there seems to be a smaller drive for a cog style belt. I assume this was for an alt/gen and if so where could I find one. 