The Jiang Dong clone engines on the Baja Heat/Warrior/Hawg Tye come with the charging coil like the 10 amp one from the NR-Racing link delray posted. You can put them on some of the other clone engines, if they have the little mounting posts for them on the block. On the only one I ever did, the little posts were there, but the holes were not threaded. I tapped 10-32 threads and mounted the coils on my engine. The light works great. You need an A/C light, and the coils are wired straight to the headlight, though you could run it through a switch if you like.