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I chased a parasitic draw for nearly a year after we bought our '03 996 C2 with evidence that the problem had existed for a long time. I went through all the normal checks, light bulbs, pulling fuses, checking grounds, with no success. It still had a 320 ma draw. I had replaced the battery and had it load tested twice. I had removed the alternator and had it bench tested at the shop twice to no avail. I finally resorted to going over the entire vehicle with the IR thermometer and found the alternator warmer than the rest of the car. In order to access the positive wire connection to the alternator I had to remove it and found the alternator was drawing over 300 ma using a clamp on ammeter from Sears. Back at the alternator shop I demonstrated to the techs that my alternator was drawing 300 ma and a new one off the shelf was drawing zero. After replacing the regulator and rectifier the drain is gone and the battery holds it's charge. The main problem here resulted from the fact that the alternator shop equipment measures in amps and does not reflect a 1/3 amp draw.
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