The alternator should have power all the time. Obviously someone had to create that circuit when they changed it to an alternator. I do not know about the Lucas generator circuitry but in a Farmall if you know what your doing you can use the original generator wires for the alternator conversion all you need to do is make a connection between a couple original wires when you remove the voltage regulator. Inn general you do not want the extra amperage the alternator puts out running through your ignition switch circuits, same applies for the generator output for that matter. When you have an ammeter the power circuit for the alternator goes through that. From what I can find that tractor does not have one. Follow through with my suggestion to look at the alternator. Maybe you have never had an alternator apart. No voodoo in them. Mark it so you clock it the same when you put it back together. All you need is a straighten paper clip to hold the brushes in to put it back together. If you sand blasted around the alternator hold the back end up when you pull it apart so sand does not fall in the back needle bearing. There is a possibility that pressure washing disconnected a poorly devised feed circuit to the alternator.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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