yep as above thats what i would but i bet he will say that he never went into the barrel the wire was allready in place but yes that would have been your problem mate if you have to sort it yourself is not a hard job to do mate just disconect the battery on car cut the wire at the barrel end leaveing as much of the wire as you can, then take out the headunit and find the same wire that end get your new wire(you can buy a small roll in most halfords or motor factors cheap) and tape it to the old wire at the barrel end (tape it well ) then pull old wire from headunit end (gently) and it should