Is the light socket you have for your indicator light an isolated ground base? It should have two wires. One socket wire goes to switched power (generally the IGN terminal of the ignition switch) and the other socket wire goes to the #1 spade terminal of the alternator. I don't see why you would hook to the coil input terminal to excite the alternator if you are using an indicator light. Unless you are running wires back to the dash from the coil for the light or have the indicator light somewhere on the motor between the coil and alternator in that wire, it isn't going to work as I envision what you are describing. If you have an ammeter in the dash, I will suggest you forget the indicator light and put a diode in the wire between the coil and #1 alternator terminal. There are several types of pigtails, with a diode already in them, available that plug right into the alternator.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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