I have a 1928 model a and coil is constantly overheating and car won't start
Is your ignition system designed to use a resistor at the coil?
I am going to assume that it has a stock electrical system. 1928 didn't use any resistor in the ignition circuit, measure the voltage at the coils positive, it should be battery voltage, if it is low that can cause an overheated coil just as much as high voltage. Also check the spark plug straps make sure you don't have any corrosion under them causing high resistances.
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