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Wiring on Serpi Star Alarm...BMW E30?

Old (dead) siren has 6 wires - brown, purple/white, black, grey/red, red, white/black.
New siren has 6 wires - brown, orange, red, white/black, red/black, grey/purple.
Any ideas on which wires link to which ?
(Original is on 1986 car, dealer fitted from new)
Keith, February 2010
Abacus Alarms have a free member section, once you register you can downlaod the old Serpistar installation wiring diagramme. It matches mine from 1990 so it could match yours.

Rob, July 2010
link Click here to see other fixes for BMW.