Quote:
Originally Posted by 40cpe
Does anyone know the resistance of the stock coil on a '39?
And what should the voltage be at the coil with the resistor warm and points closed?
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The stock 6 volt coil is .6-.8 ohms primary resisitance........on the average car you will see 3.5 volts or more at the coil ......
Assuming the resistances are the same (close to equal) each would drop the voltage 3 volts with engine not running . A running engine will supply a 7-7.2 volt feed and then they would drop 3.6 volts etc......
Pretty amazing that the coil can and does produce spark at 3 volts supply but they do very well ......
assuming everything else in the circuit is perfect....