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My 1990 964 has an amplifier (original equipment) separate from the radio that draws quite a bit of current if the radio isn't completely shut off. There should be a legend on the bottom of the fuse box lid to help identify the radio fuse. You can test the draw on the battery with a multi-meter and see if it lessens as you pull fuses. Another place that I found was a big current draw was the drivers door light switch. There is a circuit that leaves the power windows circuit live until the door is opened. My switch was bad so the window circuit stayed live and rapidly drew the battery down. Easy replacement of the switch.
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1990 964 Coupe
1986 Carrera 3.2 Targa
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