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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
What else can I help you with?
How often would you change an alternator for a 2003 Ford Expedition?
You should only change it, when it goes bad.
What would be the Cost on replacing an alternator on a 1998 Ford Taurus?
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
What causes Ford Taurus battery warning light to stay on?
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.
Why would battery light remain on after replacing the wires alternator and regulator and the battery is good on your 1989 Taurus?
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.
What would cause battery light to stay on in a 1998 ford taurus. I have had the alternator checked and was told it was good.I have replaced the battery and still battery light stays on?
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.
What would cause a 96 Ford Taurus to lose all lights and power then stall and then have a dead battery?
Your charging system has failed, probably the alternator.
How do you change the alternator brushes on a 1994 Chevrolet Camaro 3.4L?
It would be best to remove the alternator and take it to an electrical shop.
How much would an alternator cost for a 1995 Ford Taurus station wagon?
Depending on what model and motor you 1995 Ford Taurus has it can run $125.00 to $300. The price variance is due to the fact that alternators can be purchased brand new or remanufactured. I would suggest that you purchase a remanufactured model to save money. If you need this alternator installed by a service professional you should expect at least 2 hours of labor at an average of $60 per hour plus the cost of the alternator. Good luck!
Why does my 1997 Ford Taurus' battery light blink and the headlights dim when I accelerate?
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(?)
Would a bad alternator make the wipers not work on 1995 altima Nissan?
no if your battery light is on and the brake light on then your alternator need to be change
What would cause a 2005 Ford Focus Wagon to make a ticking noise cause the lights to dim and the engine to lose power?
I had a similar problem in a taurus. I had to replace the alternator.
Could the alternator in a 1999 Ford Taurus with only 76000 miles that will not start half the time be going out?
Most likely yes, I would take your car in and have mechanics look at it.
