Yes, ballast limits current to 4 amps, I think. Measure your current. I think some people think new points are junk when the wrong ballast causes too much current that turns good points to junk real fast.
My boy wants my Jubilee after I'm gone. When it's warmer I plan to measure my ballast and coil's resistance. I have a drawer full of used ballasts and coils in a drawer. I want to set aside a ballast that matches a coil.
When I was a kid, my 1965 Barracuda was 12v and had a ballast resistor. The ballast was bypassed during cranking the engine to apply full 12v to the coil and get a hotter spark. Cranking voltage is less than 12v but more than the normal voltage the coil gets when running because the ballast uses some of the 12v. There is no way to wire around the ballast on my jubilee. Some starter solenoids have a place to attach a wire to wire around the ballast.
So I used a diode. The cathode goes to the + on coil. The anode is wired to the starter terminal. During cranking the 12v going to the starter also goes to the coil.
The ballast and coil together should use 4 amps which means a combined 4 ohms total.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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