Quote:
Originally Posted by wpoll
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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Interesting, makes sense to me as that is the typical oscilloscope pattern you would see for a PWM.
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2007 M5 V10 ESS Supercharged 750chp SMG
2001 X5 Topaz Blue/Tan 3.0 
2005 X5 V8 M Sport Black on Black 
2001 530i 5 Speed Turbo Project 
and a number of other vehicles...
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