I have two defender diesels and it is the brown/white wire going to the solenoid on both, you can interrupt it through an unused switch on the dash or fit a micro switch which can be hidden anywhere you like.
www.vehicleproducts.co.uk will sort you out. Regards to all, sorry if this reply is not grammatically correct but I only went to the school of hard knocks, I missed the other one.

a car thief will easily bypass your fuel solenoid interruption switch :(

they'll just take a live from the battery :eek:
 
At least that will double the time (30 seconds) it took to enter the defender and snap the ignition barrel in order to hit it over before realising it has one somewhere...

Tom
 

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