Question about 1992 Nissan Pathfinder

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1992 Nissan Pathfinder charging problems

My Nissan Pathfinder is frying alternators. Tested the battery it is good, checked all wires, fuses, etc.. all good, but I have replaced the alternator twice. Battery is fully charged, put in new alternator and car runs fine for short distance and then everything dims and slows down and amps drop then car dies. Can someone offer a suggestion?

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  • meademm Jan 04, 2009

    The voltage regulator is inside the alternator housing and when i bought the new alternator the voltage regulator was new too.

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  • Nissan Master
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How long did the 2nd alt. last before it died? The voltage regulator is, I believe, attached to the alternator. Have u had the voltage regulator checked?

Posted on Jan 04, 2009

  • Curt Downs Jan 04, 2009

    Sorry, didn't explain this clearly, I meant the voltage reg. is part of the alt. I would recommend having the replacement alt. tested where u purchased it, (they should test it for free, or bring it to any parts store to have it t tested). It is quite possible u have purchased a defective alt. Was the alt. new or rebuilt? Doesn't actually matter, there is a lot of junk for auto parts made/rebuilt out of the country, I have been told by friends working at parts stores the return of defective 'new' or 'rebuilt' parts is far to common. Let me know how it tests, I'll help further if that's not the problem.

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HOW DO I TEST AN ALTERNATOR


Most likely yes. If you can charge the battery (get it tested after charging as well) up a quick way without any special equipment to find out if your alternator is charging is with as many electrical loads turned off as possible (heater/a/c blower, headlights,heated seats,stereo etc...) Start the engine (after battery is charged) remove one of your battery cables while the engine is running, if the engine immediately stalls your charging system is not charging. If it stays running it is charging. Do not reconnect cable until you turn the engine off to prevent damaging the alternator.
If it stalls the most likely reason is the alternator. There are still other things that may prevent it from charging. Many alternators are regulated by the computer so it could be a computer or a wiring issue or even a blown fuse. If you can remove the alternator without much difficulty then remove it and take it to a auto parts store and have them bench test it. Last but certainly not least make sure your cables are clean inside and out. An alternator cannot charge a battery with poor corroded connections.

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