Thanks for the replies, I had a look tonight and didnt get very far after a lot if fucking about, BUT, what does the multi plug behind the battery do, where is it connected to, I've never noticed this before, when I moved it I got an extra 0.4v not sure if it was a coincidence or not, also checked the ecu voltage with a volt meter it's reading 0.2v higher than the secs monitor.
that's the one you need to fix