George, I've long since lost track of what it is you're trying to accomplish.
Mark, you mean I have to have a reason for doing things? lol
My son wants to learn everything about my Jubilee. I bought the Jubilee with a rebuilt engine. It is a good tractor and will last him a lifetime.
It was converted to 12v before I bought it. The wiring was a mess, so I got rid of the old wiring and made my own wiring harness. I used the old ballast and the 6v coil.
My goal is to find exact replacement ballasts and 6v coil, which isn't as easy as you would think. A 1.5 ohm ballast was .9 ohms and the current was 6 amps. No wonder points don't last if you don't have a way to verify what you are buying.
Using my test setup, I'll easily find a replacement coil and ballast. I may even try to use a larger ballast and reduce the primary current. My test setup is very simple. Two resistors the same size, same ohms, in series is a voltage divider. If I put two 6v coils in series, each will have the same voltage. If I put 2 ballast resistors the same size in series I will have a voltage divider. Each will have the same voltage. It's that simple. I don't need precision voltmeters or ammeters.
Many YT members have no idea that ohmmeters are crap. Some couldn't tell me my 1.5 ohm resistor was .9 ohms.
Do you have an ohmmeter that can accurately measure 1.5 and .9 ohms?
Mark, I'm a full time retired physics, math, and electronic teacher. One has to have a little fun playing with simple series circuits. What do you do for fun in Florida?
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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