Posted by mrlewp87 on April 03, 2014 at 07:21:27 from (98.18.154.115):
I'm stumped. Way back I read that a ballast resistor wasn't needed if you had an ignition coil with an internal resistor. ** I should note that I'm dealing with a '53 Jubilee that had been converted to 12V when I bought it.** Last summer I left the ignition key on, popped the coil. Got a new one, internal resistor. All seemed well. But after some time the Jube would just quit, after maybe 15-20 mins. running. I chalked it up to carb issues, which seemed to have been cleared up for a time. Recently went to fire the ol' JuJu-B up...... key had been on for quite some time. I got another coil, same as last. Engine fired up after a little coaxing, but then stopped suddenly, while idling at 900 RPMs for 11 mins. Coil was not real hot to the touch, but clerk at store said the external resistor is still needed!! He said the coil gets hot, and shuts down? Just now, I read on this site; "The total resistance of the coil plus any external resistor (if used) should be 2.7 to 3.3 ohms for a 12 volt system. This level of resistance will maintain the correct voltage and amperage in the ignition circuit. Coil resistance is measured between the plus (+) and minus (-) terminals." Well, the resistance of both coils I bought-- are 3.7 ohms. So, what's the issue here? Still need the external resistor?
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