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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