Posted by Bob M on May 21, 2008 at 05:58:44 from (151.190.254.108):
In Reply to: no Spark to Plugs posted by Jim Bevins on May 21, 2008 at 04:14:56:
You mention 2 clues: A "nice blue spark" the points and the coil becoming very hot. Both indicate excessive current flowing to the coil. This will quickly burn the points. Also it will overheat/ruin the coil if run like this for very long - hence no spark at the plugs. (A normally working system will show a pale yellow, barely visible spark at the points, and the coil will not warm up noticably.)
Sounds like maybe your TEA-20 has been converted to 12 volts? If so and if the old 6 volt coil was retained, you need to insert a ballast resistor in series with the coil to drop the voltage to 6 volts at the coil. Also you probably need to replace the coil and points with new. (Suspecte the existing coil has failed due to overheating; most likely the points are damaged too).
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