If it was converted from 6 to 12 volts, did you add any series voltage dropping (12 to 6) ballast resistor between the ignition switch and input to the coil?? If not, the coil can overheat (too much current and resultant heat) and be damaged plus the points will burn up a lot quicker (too much current being switched) AND/OR GET CARBONED AND BURNED AND RESISTIVE CAUSING A WEAK OR NO SPARK AT ALL.
Did you change the 6 volt coil to a full 12 volt rated coil?? That can be done and no ballast would be needed.
Besides that neon tester, when it stops running test to see if the coil and plugs are ACTUALLY firing, they may not be because the coil is breaking down, especially if youre applying full 12 volts to a coil only rated for 6 and not using any ballast resistor.
It takes a REAL capacitor tester to check a condensor for its value and leakage etc. An ohm meter can show if a condensor is BAD like if its shorted, but an ohm meter cant tell if its actually good (nor its capacitance value) under voltage and warmed up higher voltage conditions. To a DC ohm meter once charged it should read an open circuit but if it reads a short ITS BAD/SHORTED. The "kickback test" using an old fashioned analog ohm mter can give some indication of a capacitors charging and as noted show if its bad cuz its shorted out
Id be insuring when it was converted from 6 to 12 a ballast was added or the coil was changed to a full 12 volt!!!!!!!!!!!! Then when it stops insure the coil and plugs are actually firing !!!
ALSO did you change Polarity (like + to - or was it already -??) when you did the conversion (most alternators use - neg ground) ?? Dont let anyone tell you polarity doesnt make a difference in a coil, sure it still fires if wired at opposite polarity, but not as well as if wired correctly
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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