Much of Chile is included in the Chilean Winter Rainfall-Valdivian Forests biodiversity hotspot (CEPF). In addition to mainland areas this hotspot includes the island ecoregions of the Juan Fernandez FernÃ¡ndez Islands Temperate (EoE) eoe and The San-Felix FÃ©lix San Ambrosio Islands (EoE) . forests eoe
Cars have voltage regulators that maintain their battery's charge. A multimeter, which can be used to measure voltage. An automobile engine's alternator essentially serves as an electric generator. The power generated by the car's charging system is also used to run the car's electrical systems, such as its headlights.
What you are describing is indeed a voltage regulator, not current control. This will step down a variable input voltage to a fixed output voltage. For the above IC to work it will require at least 12.5V in, which you should have at pretty much all times, even when not running, with a healthy battery.