1999 Mercedes Benz E430

Electrical problem
1999 Mercedes Benz E430 V8 Two Wheel Drive Automatic

i just bought a 99 e430, the previous owner replaced the starter and crank sensor. The car still dosent start like it should. I know that all you have to do is click key and a mechanism takes over to continue cranking the vehicle till it starts. WHAT IS THIS MECHANISM? Please help me
Walter heaney
January 9, 2010.

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