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1990 Mercedes Benz 190E 2.6
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As the rotor under the distributor cap attached to the camshaft rotates, the coil which is triggered various means determined by the position of a piston sends a high voltage charge to the center terminal on the cap which transmits through the rotor which at the precise moment the rotor reaches one of the terminals on the underside of the cap it transmits that charge through that terminal on the distributor cap and then through the high tension wire to the sparkplug.
 
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