Sounds like the replacement alternator is faulty? If you remove/disconnect the small wire from the alternator and the light goes out then alternator has an issue. If light stays on then suspect wiring or problem behind clocks/dash.
If engine cranks ok then I'd not worry about adding a separate earth lead, just make sure the alternator is secure and earthed to bracket/engine.
Does the B2 have a flashing oil warning light like mk1 Golf?
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