If you have only 12.x volts on the battery when the engine is running at 2,000rpm, something in the charging system is dead. Alternator brushes or regulator probably.

You should see around 13.5-14.5 volts with the engine at 2,000 rpm.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)