It's a regular 50v, 1976 and bright yellow (not that the color matters, just sayin...). On the forks under the speedo assembly, where the horn goes on most puch bikes, there's a chunk of metal with cooling fins on it. It has a single wire leading to it, and it's about the size of a deck of cards. What could it be? My other moby, a 1980, doesn't have one.