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Re: BMW 731 the ingnition switch will not turn to start...
Hello! this seems a similar problem to the Vw Golf, you twist the key to start and zip nothing. I repaired my postmans Golf by (Hot wiring) the starter. If you are up for this? you need to run a wire to the small power lead on the starter solenoid. I did this by purchasing a 10amp push to make button type (Door bell) switch,(Maplins) I fused it and power came from the switched live off the ignition. It is still in full working order 5 years later.
To test that the starter solenoid is NOT the fault, remove the coil or disable the engine so it won't start. Then locate the wire on he solenoid (Usually at the top and of Spade type connection maybe Black/white) remove it gently use an insulated wire from the Positve+ battery terminal and touch the clip/spade connection the starter motor should come to life, be sure not to touch any other parts of the engine with the wire could short circuit and you could start a fire. If you are unsure about the testing I would take the vehicle to a Technician to investigate.
Sorry to have made such an epic about this but it may save you a lot of time and money.
Happy New Year! I hope it Starts (forgive the pun) well?
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YOU HAVE TO PUT NEW KEY IN THE NEW SWITCH.WAIT10 SECONDS TURN KEY ON AND OFF ON AND OFF.WAIT 10 SECONDS.THEN TURN ON AND OFF.FEW MORE TIMES. WAIT UNTIL IMMOBILIZER LEARN NEW KEY AND NEW SWITCH.IF THIS DONT WORK GARAGE HAS TO USE SCAN TOOL REPROGRAM THE NEW KEY AND SWITCH.