how is voltage applied to starter
When you turn the key to 'start' a low power signal is sent to the solenoid, aka relay. which is just a switch. The wiring in the ignition is not big enough to carry the necessary power. The solenoid has high amperage 1/0 or so cables to it, and when the key 'tells' it to close contacts, contact is made and sent to starter
this will size up
Same way an F16 works-
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