After a day trip in the rain, without problems, parked the car in the driveway only to find the next morning a dead battery. Put the charger for an hour,had a coffee to give it another try. Once in the car I heard a "ticka-ticka noise comming from the passenger footwell. Removed the mats and the cover to discover the noise comming from the ECU? Anyway the shinny metal box on the right. Sounds like a chattering relay. It only quits when the battery is disconnected from the system. Can this be a rain induced short to ground or is something being powered thru a water contact from some insulation breakdown The current draw while this "chattering" is occuring is about .75 amp. This has happened several times over the past years. The dead battery thing after driving in intense rain. Car dried out in the past and no more problems until this soaker. I need a place to start. Any help will be very much appreciated. No water in footwell or any other place thats is obvious.

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Edgar