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Just to follow this up, it was indeed the Alternator, the voltage regulators or some such. Also when I got it off, the windings looked black. and the whole thing stank like a house fire.
All fixed now tho :)
Started my 172 earlier on and immediately it sounded like it had a slight whine coming from under the bonnet. As I drove home I became increasingly aware of a god awful smell emanating from the bonnet area. Parked up at home and had a look under the hood and it seems to be coming from the...