On Tue, 10 Feb 2009 01:16:29 +0000, Frank Erskine wrote:

On Mon, 09 Feb 2009 22:49:51 +0000 (GMT), "Dave Liquorice"
wrote:

On Mon, 9 Feb 2009 21:40:30 -0000, Ron Lowe wrote:

I found it to be 15.6v with the engine running. IMHO, that's too high,
and possibly the cause of the lamp problem.

Agreed, stop faffing about and take it to the dealers to sort out. Report
the blowing of bulbs and the voltage you have found. It's not right, stand
your ground firmly and politely.

Around 13·8V is the usual - that's why so-called 12V power units for
mobile CB and amateur radio are normally rated at 13·8.
I would reckon that anything much in excess of 14V needs looking at.

I suspect that LR's ethos is that Discos are likely to be fitted with
lots of accessories such as internal and rear working lights where a
higher rate of charge may seem appropriate.

Many modern cars charge at a much higher voltage than the old standards -
it's part of efficiency measures I think. My car has a 120A, 14.7V
alternator (that's the nominal volatage, it will actually output higher
voltages). The alternator has three wires specifically for the engine
management to set the required output voltage (removing the plug defaults
to high output). The high voltage *will* damage normal batteries, therefore
these cars need specific battery types.

SteveW