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Q: Check Charging System on 2005 Ford Explorer

Continously on, can't reset. Battery terminals clean, fluid levels good on battery, alternator connections all secure and good. I was told by someone to take positive terminal off battery while vehicle was running, if it died then alternator was bad. Is this true, and if so will replacing alternator fix this problem.
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Disconnecting the positive battery cable to test the alternator is an old fashion test that does not work well on newer vehicles. In order to protect the alternator during an open circuit condition on some newer cars the engine will stall as a normal condition when the positive battery cable is disconnected. Only the proper test equipment should be used on your 2005 Ford Explorer to test the battery and charging system.
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