Originally Posted by
martysmartie
You don't want to splice into the circuit by the switch else the thief can simply circumvent it! But yes typical circuits are the ignition and starter, if you immobiise the ignition circuit then the ECU does not have power anyway, do not confuse this with LT/HT ignition!
However bear in mind the age of the wiring of these cars (Cosworth isn't it?) when doing any work.
Martin
?????
I'm not saying to do this that way,just that's exactly what most alarm/immobiliser firms do,they do it all around the area of the ignition switch,wherever's a convenient spot.
I'm saying to cut a wire related to the ecu directly,not via ign switch but physically inline as most thieves won't have the brains to know wiring diagrams,you could even just cut into say the crank sensor feed as it would t start then anyway.
If you do it in such a way as to look inconspicuous then it can be more effective than even an alarm based system as only you know what wires have been cut,rather than someone who has previous experience with an alarm firm using his knowledge instead of common wiring practices.