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1991 964 battery drain

Electrical and Electronic

Vehicle Information: Model: 964; Year: 1991; Body Type: Cabriolet; Total Mileage: 75,000;

I am fighting with an electrical problem where the car's battery continues to get drained within about 3 days of not using the car. There seems to be something still electrically on and draining the battery. Is there anyway to determine which circuit may be draining too much current when the car is not running? I've tried listening for sounds and removing various fuses but am not finding the source of the problem. I'm using a brand new battery. If I run the car every couple of days then no problem the battery stays charged but if I'm out of town and the car is not turned on for about 3-4 days then the battery is totally drained. It easily recharges and the battery still tests good.Thanks for the help.

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