1988 300E Battery Drain

My car which went from no start to running great for a month after I put in your Ultimate Tune Up Kit has suddenly been experiencing a dead battery. I installed a new battery when happened but the first morning the new battery was dead. I checked the forum and found and followed directions for trouble shooting an 84 300SD battery drain. I recharged the battery, disconnected the battery ground cable and put a test light between the ground cable and the battery negative terminal. The light lit brightly indicating a current drain. I disconnected the alternator plug and again the light lit. I reinstalled the alternator plug and then proceded to pull the fuses one by one, each time the light lit brightly. I've run out of things to try, any suggestions?

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