Finally got mine fixed after 3 different garages too lazy to investigate properly, Advised by the guy who had the patience AND know how that if it wasn't fixed it would put an undue strain on the smart alternator.
All fixed now, broken in 3 places, very thin wire used by VW which is unsuitably thin for where it is situated because of constant heat cold cycles and ingress of water..
Repaired with thicker gauge wire and heat shrink to protect it.