Well who'd have funk it! I thought it was just one big block passing across others. Pffft.
The burnt end I would suspect being my heater problem and a line from that somehow.
The link to paul was great, was TD5 related mines 300tdi but I get the jist enough to see its not as straight forward as I'd hoped!
Does anyone have a wiring diagram to show me what wire goes to what? I'll find Paul and bang him a PM for the block anyways but its not great working blind