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FWIW, I think what you are seeing on the 'scope is just high frequency "leakage" on the unterminated (floating) starter DC wiring. The high input impedance of the 'scope will tend to pick up spikes etc. from the many PWM cicuits in the car...
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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