John V, your question "What is the purpose of the yellow wire in my picture that also goes from the coil but connects to the side of the distributor? It is the smaller, thinner wire."
ANSWER the small yellow wire that leads FROM the coils small LV Primary terminal TO the small terminal on the side of the distributor is to conduct the coils LV primary current to the distributor and its internal contact points. When the points are closed current flows through the coils LV Primary to ground via the closed points and when the points break open coil current suddenly stops.
The coils other LV primary terminal is what gets voltage via the ballast resistor when the ignition is turned on.
A test lamp on the coils LV primary output (small yellow wire to distributor) as engine is cranked over needs to flash ON when points are open but go off when they are closed.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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