Thanks Patrick, you seem to know your way around this stuff. I cut the plug off so I could remove the wire from behind the starter motor and I remember it did look a bit bulky so it could have a diode in the back of it, it had been repaired with heatshrink at some stage.I will strip it back and have a look at it. The red wire just went straight to the battery, the black wire went to a funny looking round thing which could be a regulator for the A/C but it has no fining on it so I doubt it is.I will check what I get out of Red to ground and black to ground. All the wiring loon had been repaired in a sort of rough fashion so I have to stumble my way through what had been connected to what Thanks for your help
