Hi Robin,
Bit of an old thread this, but did you ever find a wiring diagram for the Scorpion T5000 alarm/immobiliser system?
I find myself in the same boat. The alarm's not responding to either of the remotes and Scorpion (still in existence) no longer support this particular model.
Last time this happened about three years ago, it was just a case of sending the Scorpion T5000 control unit away to Scorpion and for £24 + VAT it would be re-programmed. This time I have to fit a complete new alarm!
Any help would be much appreciated.
Steve.