On Tue, 10 Feb 2009 14:20:53 +0000 (GMT), Dave Plowman (News) wrote:

Donno, but as the vehicle is also chewing through bulbs it indicates
that the entire +v rail is elevated not just the charge circuit.

But the alternator output is connected directly to the battery - so
apart from some voltage drop which should be tiny, the two are the same.

Assuming that there isn't some form of regulator between the battery and
the car +v rail. What happens in a car with one of these "over voltage"
charging systems? Surely the whole vehicle +v rail doesn't also rise or
you end up chewing bulbs... There is more to this over voltage charging
system than meets the eye.

--
Cheers
Dave.