Alternators
Car Batteries

Why would battery light remain on after replacing the wires alternator and regulator and the battery is good on your 1989 Taurus?

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2005-10-30 02:06:55
2005-10-30 02:06:55

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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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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I believe that is in the back of the alternator

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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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Most Ford alternators have an integrated regulator... it's inside the alternator.

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The voltage regulator on this car is part of the alternator and is easily removable with 3 screws.

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The voltage regulator is locate in one of two places. ***The voltage regulator is located in the alternator if you have an IAR type alternator*** ***The external voltage regulator (for the EVR-type alternators) is located on the driver's side wall, right next to the battery. It's much easier to see and/or remove if you remove the battery first. It has "Motorcraft" in raised lettering across the front*** I just had to remove mine.

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Usually the voltage regulator is the problem. Its located inside the alternator. More testing is needed to make sure that the regulator is the fault. If you want to guess. Replace the alternator. Sounds to me like the power steering and alternator belt has fallen off.

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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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Alternator is not recharging the battery. Have the alternator tested or test it yourself with a volt meter. You should read from 13.5 to 15.5 volts DC at the battery with the engine running. If any lower the alternator needs replacing. We had already changed the alternator, and bought a new battery. It is still doing the same thing. It will idle ok. When you drive it, you go down the road around a mile or so, and the darn thing shuts down again, and the battery is dead again. Are you sure the serpentine belt is not slipping? Did you replace the voltage regulator along with the alternator? If you answer yes to both these questions then I suspect you have the alternator wired incorrectly or the battery cables need replacing. The latter is what I suspect is the problem. You may have an internal break in one of the battery cables that just does not show up all the time. Look for a bulge in the cable especially a cable running next the the exhaust.

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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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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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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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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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It should restart normally after replacing the battery. If not, it could be a security mode the car has entered. You should question a ford dealership about it.

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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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The alternator is somewhere around $125. Not sure what labor would be, but plan on at least a $100 for it. Changing the alternator yourself isn't really a difficult job - See "Related Questions" below for more

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ooohh, probably just because fords suck- that's probably gonna be your main reason, yah.

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The problem is in the voltage regulator, BUT you may NOT need a new a whole new alternator !- The Voltage regulator block is easily replaceable in these alternators and costs about $30. ( compared to over 200 for an alternator). I have done this repair in 3 Taurus's.- If you can't fix this, I would advise taking it to an independent 'Alternator /starter' business. I see many in Canada. You usually get a good repair cheaper than at dealer.


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