Right, just to clarify.
Ive been through 3 batteries. I then brought this to the attention of the service guy who told me to fit an isolator and mentioned i could be leaking charge because the positive battery cable was hard up against the frame.
I then installed an isolator and when i turn the accesories on (one turn of the key) the volt meter was reading 11.9v
The engine would start no problems. When the engine was running it reads a constant 14.4v so i know the alternator is working and charging.
Everything was fine, then wednesday as i said, machine ran fine in the AM then after lunch the volts had dropped and it wouldnt start.
Now i thought that normally when i turn the acc on the volt meter should read about 12.7ish volts then when its running it should be reading about 14.4ish.