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To understand the risk, you must first understand the role of the alternator. Unlike a dedicated wall charger, your alternator is an AC generator that uses a rectifier (a set of diodes) to convert AC into DC power for your car. Its primary job is to power the vehicle's electrical loads—lights, radio, fuel pump, and ignition—while replacing the small amount of energy used from the battery during startup.

When you jump start a car, you are introducing a massive surge of current. If the receiving battery is completely flat, the alternator’s voltage regulator senses the "hole" in the system and commands the alternator to output its maximum amperage. According to SAE International standards, alternators are rated for specific duty cycles; forcing one to run at 100% capacity for an extended period can lead to charging system problems and total failure.
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