Posted by JK2 on March 23, 2019 at 09:41:13 from (166.216.159.196):
In Reply to: Resistor question posted by Grandpa love on March 23, 2019 at 06:00:18:
I see no one mentioned the reason for having a ballast resistor and a coil. During starting an extra wire from the "I" terminal on the starter solenoid to the coil side of the resistor applies 12 volts to the coil for a hotter spark while starting. This makes a considerable difference in how the engine will start when it is very cold. If there is no provision for connecting this wire to the solenoid, it can be run though an extra push button switch from 12 volts to perform the same function. There are other ways to supply 12 volts to the coil during starting using a diode in the wire with the cathode of the diode pointing toward the coil.
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