Try the plug/feed from the right hand handlebar switch cluster.
Andy

That's a 4 pin plug

I think there may be a 3 pin plug which controls part of the ignition / injection sytem...I don't have access to an ST4 wiring diagram, but the 996 one I have has it on that diagram as feeding the injector relays
This is a logical location for another circuit break to immobilise the bike.
Do you have the wiring diagram inthe back of your hand book?
If so, it shows the number of contacts in each plug inthe loom & you may be able to deduce the poisition it plugs into fromthat.
Failing that, give Nelly a ring tomorrow..
Cheers
Andy

Thanks rushjob I will look at the wiring diagram if not I will ring Nelly, do you know his number,

Thanks, Stu

01623 758877

Thanks Rushjob, :D