[Pills]

Haven't had much time over the last couple of days to check things out, but I did try starting her up and turning on lights, heater etc as suggested by Andyl, to see if the increased load would replicate the thermo fan effect, but this made no difference. The "earth" suggestion has been crossing my mind as well as I get a big variation in voltage reading when grounding the multimeter to the chassis or the motor. The weather should be better tommorow, hopefully I can have a good look and try a few of your suggestions. Again, thanks for all your input guys. This forum is trully great.
By the way, the alternator appears to be fairly new or reconditioned at least, considering the age of the rest of the mechanicals. My hunch is either its a badly wired relay or the alternator has developed a fault. The earth through the bracket should be good, if not, I would think it would appear as an intermittent light on/off situation.