Buying a 1988 320i tomorrow and it has an electrical problem. Radio, tach, obc all don't work, you know the typical fuse 21 problem. Anyway, he's already tried changing the fuse, it just pops as soon as he puts it in. He says he's searched the typical areas for shorts except for behind the radio which is the factory one I believe. Anyone have this problem and know possible fixes? Could the SI board cause this? Thanks

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