My car all of a sudden drains the battery. I had to charge the battery to get to work, then again to get home. When home I immediately did the drain test, placing an ammeter in series with the battery cable. I'm getting a draw of over 500ma. I pulled each fuse from the fuse box and a few sattelite fuses... still over 500ma. I swapped the battery - no change. What do I do now?

This car is a daily driver. No work was done to it recently. The wiring harness has been replaced.

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95 E320 Cabriolet, 169K