Question about 1997 Nissan Pickup

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95 p/u why would a brand new alternator fail after about two months?

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It happens especially if you bought a rebuilt alternator. It is warrantied so take it back for replacement and this time buy a different brand or buy a new one.

Posted on Nov 12, 2009

  • NOT ME Nov 14, 2009

    I should have added that jump starting a car with a dead battery and then allowing the alternator to charge this dead battery will at times put a strain on the alternator and cause a diode to fail. Never charge a dead battery with the alternator. Use a battery charger if at all possible. If that is not possible, drive home immediately after a jump start and charge the battery with a battery charger. Alternators are not made to charge dead batteries. Their purpose is to keep a charged battery fully charged.

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  • Nissan Master
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Hi:
Auto parts do fail, sometimes too soon, But some of the reasons a alternator could fail prematurely, would be if you somehow had a dead battery, and jump started the truck, sometimes the full current draw to charge a dead battery can kill an alternator. An overtightened belt can cause the alternator bearings to overheat too, killing it.

Posted on Nov 12, 2009

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What's the voltage reading at the battery with the engine running ? 13 to 14.1 volts ? If not, it's not charging .Sounds to me like it's not charging ! Is there battery voltage at the heavier gage wire on the back of the alternator ? Does the battery symbol light on the dash work ?

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Nicole; check the alternator belt, loose,worn, is it still there and on.
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If it was rebuilt, could be it was just not a complete rebuild. Some remans are just fixed and cleaned up. Some are completely gone through and good as new. You should have a warranty. Most good remans come with a lifetime warranty or at least one replacement as long as you own the car..

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Have your alternator tested too; if it has a sick diode, it can drain the battery and also shunt current away from the starter as well as damage the battery by applying unrectified voltage on one leg of the output. I replaced SIX (6) Delco alternators in nine years on a car built in '95. It would have been more except the engine failed at 57,600 miles and I junked the lemon.
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