I started the bike, letting it warm up for a few minutes. Everything is good except no headlight. Next thing I know, it just dies. Nothing on. The main 15a fuse is blown. Pickup a few fuses, same thing happens. Starts up, everything works except the headlight & fuse blows again. I've changed out a few things since my son bought the bike. All lights are LED. Replaced regulator/rectifier with a kohler unit & when that died I put the Sparck moto unit on. Last time I rode the bike everything functioned. Battery shows 12.78 volts. Put 2 other H4 bulbs in, none of them worked. Any ideas?