Two local garages have failed to solve this one!
Apparently all the electrics are OK BUT either the battery is not charging properly or it is discarging for no apparent reason. Car has had 3 new batteries since new. Can't be right can it? Only done 10,000 miles since new.
Is it something to do with alarm system?
Help please fed up with charging/buying batteries!

Rod, May 2009

Thanks John
I gave it a try after 30 mile run and disconnected live.
Left it for 2 days and battery still OK!!!!!!
No problems since but any day now............

Rod, June 2009

Lets see if this garage can help you....with the engine running, your alternator should be charging your battery at around 14.4 v or thereabouts. With the lights on, the voltage should remain about 13.8 to 14 v if the alternator is ok. However, with the engine off, the alternator can quickly discharge the battery if its diode pack is faulty - this is like an electrical valve that 1) Changes AC into DC 2) Prevents the alternator from becoming like an electric motor, running your battery back down. So, to check this - once you have stopped the engine after a run, disconnect one battery terminal. If the battery retains its charge then I'm right. If it doesn't, the battery itself is goosed.

John, May 2009