A relay is nothing more than a very heavy-duty switch that does a lesser switch’s bidding. A small electromagnetic engagement coil consumes on the order of milliamps means just about any switch can activate it.
To address this problem, cars also have alternators. Alternators are actually small generators capable of turning mechanical into electrical energy. Driven by the engine belt, alternators use a small signal from the battery to energize a field current that turns a rotor inside a set of stators. Since this energy is driven by the polarity of magnetic fields, the current produced as a result changes direction as the rotor turns, producing current in opposite or alternating directions (hence AC). Alternators produce significantly higher currents than initially supplied by the battery, so they are used to recharge the battery itself and power other electrical components.
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