Fitting Alarm to YBR125

Hi guys.

I got my YBR a few weeks ago and am currently fitting an alarm to it.

I've got the basics working, ie, it's alarmed, but it also works as an immobiliser and thats where I'm struggling.

I need to identify where to connect the wires around the ignition fuse and input trigger on the start relay

If anyone thinks they can help, please give me a shout and I'll supply photo's, circuit diagrams and alarm manufacturers instructions.

I cant get my head round it..

Thanks in Advance

Si