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MG MGF Technical - Battery drain??

i've had problems, with my battery going flat, after leaving for 24 hours or so, battery tested ok, as did alternator, with everything switched off there appears to be a current drain of approx an amp or so, grateful for any help

cheers mark
keith wilkie

I wonder who will be first?
CHECK THE ARCHIVE
Brian

Like Brian says, check the archive for threads which contain the words Battery and Drain.

There is a relay box mounted underneath the MEMS unit on the rear engine compartment wall (wall between engine and boot). It is black. A relay inside this box is possibly stuck on. The relay is supposed to remain on for about nine minutes after the car has been switched off so that the radiator fans can cool the rads and the engine compartment fan can cool the engine compartment, if necessary. The relay also supplies other components and it is this drain of current that you could be experiencing.

The MEMS relay unit is replaceable and also repairable as I found out on mine. To start with you could try giving the unit a sharp tap with a screwdriver to try to release the relay. I opened mine up and adjusted and cleaned the relay contacts and have had no problems since (18 months). I believe a new unit would have been about £35.

Hope this helps

Bruce
Bruce Caldwell

Found the thread entitled 'Unexplained Flat Battery' in the archives of this section.

Bruce
Bruce Caldwell

Check the boot lock. I had this problem and it was all down to the boot light staying on sometimes. The dealer adjusted the boot lock and it was sorted.

If you know anyone who'll fit then get them to lie in your boot to check this. Alternatively, if you have a video camera, set it to record and put it in the boot....
John Philpott

And the most simple options - check the interior lights go off, they are in the bottom of the rear view mirror and can be switched on permenently, or you might have a fault with the door locks - can you superlock the car(if you have a fault in the boot light circuit or in the door circuit then the answer should be NO)
Will Munns

The boot lock can be triggered with the boot still open - just push the lock lever with a screwdriver.
jon baker

This thread was discussed between 06/08/2002 and 07/08/2002

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