The battery on my MGF Mk 2 occasionally discharges completely overnight, so the next morning the car will not start without a booster.  Does anyone know of the cause of this?  It is not consistant, just happens from time to time, last week it was fine for 6 days, then suddenly failed again on the 7th day,

I have heard that one of the relays associated with the ECU has been known to stick closed, but I have not found any further information, such as which relay, what circuit is it associated with, etc.

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