Where does the coil get its power from?
In the modern vehicle, there is are two ways that are used to supply power to the coil. I guess I had better give a little background: The old 6v. system used a coil that was designed to operate at the normal charging voltage of a generator supported system. This was about 7.4 volts. The coil would function properly with this voltage applied to it. Because many of the early vehicles had a mechanical pedal on the floorboard that actually engaged the starter motor to the ring gear on the flywheel (no Bendix unit) and simultaneously closed a mechanical switch mounted on The starter motor, most early cars and trucks use the following ignition circuit: A wire runs from the battery to the ignition switch. Another wire runs from the ignition switch to the “BAT” terminal on the coil. That’s it – pure and simple. With the invention of the Bendix drive unit, it was no longer necessary to have a direct mechanical linkage to engage the starter. This meant that it was possible to have a solenoid (r
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