Thanks for the info tim. I had a quick look when I could but couldn't see a light green with yellow wire so I will check it out with the multi metre tomorrow.
I did start looking into making a new relay or getting into one of the spare engine bay fuses but right now I'll just use this temporarily if it works. The reason being is I thought it I power off the radio unit will it lose power? or does the plug supply a constant 12v?
molex?