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AutoElectro Alternator AEA1100 Plug Terminal Replaces 1504563,1537179,5003897 The alternator works by converting the mechanical energy created by the engines crankshaft into electrical energy, this process is known as induction. A rotor sits inside wound copper wire within the alternator. While you’re driving the rotor spins around to create an electric charge that provides energy to charge the battery. The alternator recharges your cars battery while it is running, this allows the battery to power your headlights, sound system and other electrical loads. Life expectancy of the average alternator is 75-100 thousand miles. Alternator Charge Current: 34 A with v-ribbed belt pulley Plug Terminal