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I most cars when you are starting the engine, the car uses direct battery current to the ignition system, once you go to the run position on the ignition switch the current is regulated to prevent damage to the ignition circuit. Cars used to have ballast resistors for that purpose to prevent an overcharging alternator or generator from frying the points and condenser.
Ancient tech but still used just controlled differently. Helps you get the car started when the battery-charging system is weak.
regards
Mech
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