Question, is it 12 volts originally. Reason I ask is that if it is , no doubt it will have a solenoid on starter or starter relay with a bypass terminal on it. This is to supply full battery voltage to ign coil when cranking. There will be a two small wire terminal, and one wire goes directly to coil, other is a resistor wire coming from ign switch. Hard to tell by looking at the wire. You can put a volt meter on that terminal and at input side of coil to check your voltage. Points have to be closed so they are completing a circuit. If you do indeed have what I describe you will read about half of battery voltage. Now, while cranking, the voltage at that terminal should be same as cranking voltage of battery. May just be a bad relay but could be other wires or connections. At any rate, you are getting very low voltage to coil during cranking, thus poor spark for starting. You can check resistance of coil with ohm-meter. If it is a true 12 volt coil the readings between the two primary terminals will be about 3 or 4 ohms. If six volt, which it should be ,it will be l.5 to 2.5 ohms. So many guys look for visible resistors, when later model tractors incorporated it in the wire and is invisible. But if it has two wires leading off one terminal of solenoid or magnetic switch, it is in harness.
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