I have a tys125f (sy125f) and when i brought it had a partial wiring loom.I need a rear brake light so i decided to fit it and add the extra wiring.I also wired up the horn,kill switch and ignition and brake light from hand and foot.All was well and all worked untill i revved the bike up and it popped the bulb.tried another and on tickover ok but when revved it popped.I guess it's that alloy finned thing i left out because i didn't know where it went ! ( i know rectifiyer / regulator i think ) i cannot get any info on wiring it in ( sh620b-12 ) is the number on it. If i am looking at the front of this with fins at the top the plug at the bottom shows top left a black wire,bottom left a yellow wire,top right a red/white wire and nothing in bottom right. There are the same colours on the bike on the original loom /cdi i think but did not want to just fit this incase i bugger something up. Any help would be very much appreaciated so i can get my bike registered and have some fun.

see if you can open this file attached it is all i have at the moment.

sy125_wiring_diagram.doc

thanks, i have sussed it now i ordered a universal regulator that should do the job the the rear brake light and horn.Will post a reply either way.

Thanks again