 I asked last week about using a 6V coil on my 12 volt system after I had left the key on and had a no start condition due to no spark, not dead battery. I installed my old original ballast resister, the 6V coil and a ceramic resistor from NAPA that was supposed to be 1.8 ohms but actually tested out at 2.1 ohms. (Napa's book listed as 1.83 ohms) It would not start, no spark. I had voltage at the top of the dist and it pulsed with the rotation of the engine showing me the points were opening and closing.
I had another resistor of unknown resistance (left ohmmeter at work) which I tried, still no start, no spark. I removed the dist, checked the points and condenser using jumper wires, an old automotive round coil and homemade sparktester/sparkplug. It showed spark ok. I then backed up, went around the ballast resistor, using just the unknown ceramic resistor. Spark yes, engine starts yes, Questions answered no. I know the unknown resistor will remain a mystery in the equation until I ohm it but I question why the 1.83 Napa resistor and ballast resistor would not work? I also tried it straight across using just battery voltage without results. I read a lot on here about testing coils and understand how to read the ohms across a coil and that it may be good cold but not after warmup. I am more interested in building a setup that I can test a bench coil using jumper wires, points/condenser or maybe an old auto distributer. At my dad's old shop is an old dist tester called a stroboscope, I may get it and see if it can be of any use to me.
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