The description in the service manual for Saturn cars says that if the circuit for one plug becomes open the other is grounded through the ignition module. That leads me to believe that there is a circuit in there that has a higher resistance than is normally encountered in the secondary ignition circuit so it only becomes a factor if the resistance for one of the plugs goes out of its normal range.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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