My car will start, but when I turn anything on it tries to die. Is it the alternator or voltage regulator?

Asked by Aug 02, 2016 at 05:04 PM about the 2002 Nissan Pathfinder SE

Question type: Maintenance & Repair

1 Answer

78,005

Check the voltage at the battery with it idling, it should be between 13.8 to 14.2 volts, if it is lower then the alternator should be tested and replaced if confirmed bad, if the volts are higher then the regulator is bad and can burn out the alternator in a short time. A lot of times it is just cheaper to replace the entire unit than just to replace the regulator. HTH

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