The three pin connector (X1560) has: -

1 - +VE (12v) via fuse F5 (7.5A) - GN/RT
2 - Connection to LCM (Night Lights) - GR/RT
3 - Ground connection (31L) -BR/SW

HTH...

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