I understand your voltage analysis and agree. If you checked from ground to the battery cable at the solenoid you would get battery voltage all the time. If you put the meter from ground to the terminal on the solenoid connected to the starter, and turned it to start/pushed the start button, that terminal would also show battery voltage. If the connection was bad to the starter the starter would not spin. If the starter has bad brushes it could be open circuit inside and be erratic. If this starter has a stud on the side to get electricity from the solenoid, and the solenoid is not also used to push the starter drive into the ring gear, I would assume when you touched the cable to the stud, the engine turned. If the solenoid is just a relay (no mechanical link) a ford solenoid from a 1960 Galaxy 390 V8 will substitute Using only the S terminal for the start circuit. Jim
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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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