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Old 12-11-2012, 01:11 AM
Billwill Billwill is offline
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Location: South Africa
Join Date: Oct 2009
Posts: 529
Mein Auto: BMW E30 318i 1991
There is another cause of a starter motor turning but not engaging the the flywheel on the motor.

This is if you have the Black/Yellow wire on the wrong post on the solenoid.
There should be two small posts on the has the Black/Yellow wire which is +12 volts when you turn ignition to ON and the other is a Black/Green wire which is for the unloader relays.

Make sure these are the correct way around.

Sparks coming from the starter motor indicate a bad winding on the rotor so every time that section of the winding comes under the brushes at the commutator ring...sparks happen!
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