Alternators
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2002 Taurus 91K battery died - replaced battery but it keeps going dead. Alternator is fine. Any suggestions?

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2005-09-11 15:30:09
2005-09-11 15:30:09

Sounds like you have something that is on all the time and drawing power from the battery. Check, dome, courtesy, trunk, hood, glove box, and brake lights.

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Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery. The alternator should have 2 connections.

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Could be a bad signal sent by the computer or the alternator is not charging to full capacity. Have someone check the charging amps on the alternator.

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Defective alternator, dead cell in battery, or something is on pulling power from the battery.

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I'm not sure about all of these, but I have a 98 Taurus and the battery light came on. After a few days, the car died altogether and I had to replace my alternator. I would definitely take the battery indicator seriously and have your alternator checked.

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you may need to go to your local shop and if they are equiped with one get them to attach there scanner to the vehicle and clear the codes for you.

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You will destroy the voltage regulator if you unplug the battery while it is running, then you will have to replace the alternator anyways.

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Sometimes an alternator with a weak diode(s)can test out fine, but can still trigger the light. I believe the problem is in your alternator. Good luck.

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This can be due to loose or corroded cables and or connections , and did the car start even at least once after the battery and starter was replaced? If it did you probably need a new alternator or if your handy enough you have the choice of rebuilding the alternator. Many stores offer free alternator testing , I my self have a 96 Taurus and i have had many problems over the years and now I'm at the point where my alternator is bad and i will soon be rebuilding it. If it is none of these issues then there is some thing more serious wrong in which case it needs to go to a mechanic who can determine and fix the issue.

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There isn't a fuse for the alternator. The alternator is belt driven, and there'll be two lines coming from the alternator - one goes from the alternator positive to battery positive, and the other goes to ground.

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your alternator was never the problem. Its your battery and/or charging system. the reason the lights get brighter is because the car isn't getting the propper amount of energy from the battery and is having to directly draw off of the alternator. when the engine is rev'ed the alternator spins faster creating more current to charge the battery, witch is why the lights brighten at higher rpms.

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could be alternator or charging circuit or could be anything got to do with the battery when its draining out loose connection terminal

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As often as the alternator fails... ;)The alternator is not a 'consumable' type of part that requires routine maintenance/replacement - like a serpentine belt, brake pads, etc.Many repair shops and auto parts stores offer inexpensive or free alternator & battery testing.Be sure to test before replacing!NOTE: it is a little known fact that a weak or failing battery is a major contributor to premature alternator death. Any battery that is 4 years old is a prime candidate for replacement.See "Related Questions" below for information on how-to replace Taurus / Sable alternators

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Does your Bat warning light stay on or if you have a Voltage gauge what does it read. Was your battery fully charged before you installed your new alternator? Remove alternator and have it tested to besure that it was indeed the problem.

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With the engine running you should read from 13.5 to 15.3 volts at the battery with no lights or accessories on, with a nominal voltage at idle of 13.8 to 14.2, depending on temperature and battery state. Any less or more and the alternator is bad.

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I would find a local auto parts store that offers free battery and alternator testing - both of which can be performed with the parts on the car. My own suspicion would be a physical failure with the alternator - bearings possibly(?)

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WELL YOU MAY HAVE EITHER A BAD ALTERNATOR/CONECTION OR YOU ARE DISCONECTING THE NEGATIVE SIDE OF THE BATTERY FIRST. TRY DISCONECTING THE POSITIVE SIDE FIRST IT SHOULD THEN STAY ON.

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Unless things have changed, the diodes are part of the alternator. The voltage regulator is attached to the alternator but the diodes are part of the alternator.

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Bad connections somewhere in the car battery, alternator, feed line to ignition switch You must have a error code posted or the electrical is shutting down so the computer cant record an error.

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The first place I'd start would be the battery, alternator and starter. Verify that the battery is good and that the alternator is fully charging it, and that the starter isn't drawing too much current.

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Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alt belt.Also check that the belt is routed correctly - I found a wrong way to route the belt and had similar symptoms.See "Related Questions" below for routing diagram sources

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Serpentine belt? You may have to remove to tighten alternator


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