Club 80-90 Forums

Could someone point me in the right direction on how to wire up a ignition cut off switch? Not looking for anyones "secret Switch" location, just what equipment i need and where to join up the wires. i s it to the battery or i saw something about a negitive ternminal on the coil.
its a 1990 wbx, automatic, LHD.
PM's are most welcome if you don't want to say anything that you feel might give anything away
cheers