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Hi, are you saying that the starter will not turn the motor? Or is it cranking but not starting?
You might just have a bad starter. Can you test for power to the small wire on the solenoid when turning the key to start?
The starter gets power from the N65 relay at the rear of the main fuse box under the hood. You can test the starter circuit from the N65 relay if you have a test light or a voltmeter.