Ignation problem

I have a 1994 volkswagon jetta with 97,449 miles
the vechile was given to me and I have started to do some repairs to it but, when I turn the ignation on and trun the rh turn signal it turns the car over(starts it) but if I do not turn off the signal the starter starts to grind. I have only found one cut wire behind the fuse box that was jumped to a hot wire( thinking is hot) what do I do if any thing. Also the radio was replace ( non-factory) if this helps any