My 72 transporter has an under dash horn button and has been wired from fuse to switch to horn then to earth. i.e. +ve wire switched. I want to wire the original horn button on the steering wheel but am having trouble understanding the wiring. It seems that the -ve wire is switched. i.e. from fuse to the horn then horn to horn button then to earth. Correct? If that is so how does the wire inside the steering column connect? And where to? How does the wire not get twisted and break? How is the horn button effectively earthed? Any assistance is appreciated.