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Hi there, and welcome.
Personally speaking, I wouldn't recommend trying to wire-in a switch to your existing system - traction control on modern cars is rarely done by mechanical means - its usually operated through the ABS (and the drive by wire throttle) and controlled by its sensors.
You may have to swap a wiring loom from a car which already has this feature.
Hope that helps.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater