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1989 911 Carrera Fuse Blowing problem

Electrical and Electronic

Vehicle Information: Model: 911 Targa; Year: 1989; Body Type: Targa; Engine (type, size, modifications): 3,2; Total Mileage: 80000;

Starting with total battery drain after 4 sitting days, after battery/charging test no faults found. Did find that #4 fuse (radio, clock, intl lights) was blown. When tried to replace, sparkes at fuse and blown fuse (ground prob?). There are a total of 5 wires going in to fuse. After isolateing all wires: block 1 had large hot lead and small lead, block two had two small leads not hot, and the 3rd block (on the opposite end of the fuse) has a small black wire. The black wire seems to be the culprit as when all the other wires are connected w/o the black one, the fuse stays in tact. Also, using a voltmeter, positive to a known hot lead, the black wire works for ground. This, I should say, is all with the ignition off and no key inserted.

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