Alternator: Device that generates the electric current that charges the battery.
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It can be found next to the engine and it is activated by the poly-V belt. While the engine is running, the alternator will charge the battery. Inside of it there is a voltage regulator that limits the electric tension that will be delivered.
I have a 2009 Mercury Milan premier 4 cylinder 6345, miles. I have changed the fuel pump, fuel filter, alternator battery and checked fuses but car still will not start. First it would start than stall out while driving down the road