Posted by Janicholson on April 25, 2020 at 07:15:21 from (24.240.46.228):
In Reply to: confused over coils posted by Charlie M on April 25, 2020 at 06:32:57:
Many car companies determined that the starting process in cold weather (Detroit) was a problem. The starter could draw enough current that the system voltage might drop to 4.5 volts. The coil was only given that amount, causing weak spark. The solution was to use a coil that was designed for 3.5 volts or so giving the starting process a good chance. This starting voltage was delivered to the coil from a connection direct to the starting circuit. this is only supplied when the starter is turning the engine. (several methods are used to do this "bypass" circuit) When cranking results in a start, the bypass voltage is shut off. The ignition circuit through the switch has been on all this time, but it runs through a resistor dropping its voltage to the 4.5 or so volts for the coil. Remember that the running voltage of the system is a bit over 7 volts, charging the battery. This keeps the coil happy, and allows cold starts to be much more successful. Jim
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