If the oil pressure switch has only one terminal. it is either normally open, or normally closed. (usually normally closed.) The warning light is not grounded at the light, it will have two leads. (or the wrong light is in the hole). One lead goes to the ignition, the other goes to the pressure sw. wwhen the engine is on not running, the Switch is closed lighting the light. When it starts, the Oil pressure opens the switch and the light goes out. The alternator is a different animal, and we need to know what kind it is, and if it is a modified version of that. There are too many variables to try to guess. JimN
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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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