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alternator? battery?

2002 ford escape - started it and lights were dim - put it in drive and it went about 100 feet and died. tried to turn it over - click, click, click sound. jumped it and it started right up. let it sit running for about 20 minutes - all fine. put


Sounds like the Alternator to me. i don't know what the dashboard of the car is like but it should have either a volt gauge or a alternator warning light, if your volt gauge is reading low, well below 13 or 14 volts or the alternator light is on then

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Alternators & Batteries
Alternators have long surpassed generators as a method of charging batteries, and providing power to the various on-board electrical devices in modern vehicles. ...

Catalog
The alternator soon replaced power used from the battery while sitting at the ... The alternator will generate power to operate the electrical system plus keep ...

Charging System Basics
A greater difference of potential (voltage) between the battery's voltage and the alternator's output voltage will provide a faster charging rate. ...

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These are strong indications that the battery system has failed. ... Alternators were designed primarily to provide a "trickle charge" to a well-maintained battery. ...

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