Most cross-linked wire has a secondary benefit: more and finer strands. Since electrons flow along the surface of a conductor and not through the conductor, a conductor of equivalent size with more and finer strands can carry more current.
The other major issue within a car electrical system is that not all components tolerate the same amount of current strength or amperage. Therefore, the system must include voltage regulators and fuses to moderate flow and protect components that cannot handle the amperage supplied by the alternator. Fuses protect circuits when placed in front of the load (component). If a voltage spike causes too much amperage sent to the headlights, a fuse designed to “blow” at 15 amps will do so, preventing the current from continuing on to cook the headlight itself.
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