What year is your car? On the MKIII (86.5-92) there is a fusible link in the engine bay fuse box which can cause this. It's on the far left side and labeled "100A Alt"... in the earlier MKIII's it looks like a regular piece of wire, but it its not and needs to be replaced with either the sealed FL that was used in later models or a new, old-style FL wire.
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