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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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