battery drain????

[mildwin]

What sort of problems would cause a brand new battery to go flat within 10 days? Car was fine for about a week, then needed a few extra revs to get started on 3 mornings, then nothing, totally dead. Mechanic said alternator is fine. Any ideas?

[dickyboy69]

sounds as if you have a drain on your car get mecanic to test car with everythingswiched off i had this problem on bmw deisel and heater plugs wern`t swiching off thus flatening battery after a day or two

[NORMANTHEDOG]

could be a light on ,interior or boot,could be the coil,could be a dodgy earth,or it could be the battery,i know its new,but how long was it in the shop.

[mildwin]

I do do mostly short journeys but surely a brand new battery would last longer than 10 days??

Mechanic has looked for obviously drains & found nothing. Will have to get him to do a thorough check.

[mr rusty]

Get yourself a cheapo multitester from Maplin or somewhere, less than a fiver,set it to the 'amps' range, and connect it to the positive side of the battery between the battery terminal and the positive lead.

If it shows a discharge with everything turned off then all you need to do is start pulling fuses one by one until the discharge stops-then you've found the faulty circuit.is this what the mechanic did? thats how you track this sort of fault down!!

Obviously some things run all the time like radio setting saver circuit and the clock and immobiliser circuits, but what you're looking for is a change from an unexpected circuit, such as a window motor circuit or similar....

But it could of course just be a faulty battery even if it is new, but then i assume your mechanic would have put the drop tester on it to check!!

[mildwin]

Mechanics just been again & turns out it IS the alternator! Any ideas how much??