Quote:
Originally Posted by 30-9
1939 stock car. What would be symptom of an original ballast resistor going bad? Can it be intermittent? Work and then not work?
Is there a way to get test to insure it’s working properly?
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Symptom would be low voltage at the coil. With engine stopped should be about 3 volt. (the voltage drop thru the resistor is about 3 volt)
Test voltage at the coil. If low, work back to see where problem is. Should have 3 volt at the output side of resistor. Should have 6 volt at input side of resistor. Should have 6 volt output at switch, 6 volt input to switch. (all these voltages can vary a few tenths of a volt, depending on you battery voltage, connections, etc)
As you are working in the garage, you should minimize the time the ignition switch is on. Turn off switch after each test. With engine stopped, there is full maximum amperage running thru the circuit, is hard on the coil.
And don't touch the resistor while on; it gets very hot, very quick.