Question about 2003 Ford Crown Victoria

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Battery indicator light is on,replaced alternator,had battery tested,belt is tight,what could cause this?

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Voltage regulator?
bad alternator - yes you may have gotten a bad one.
main fuse.
wiring - did you put all the wires back the right way?
test the battery in the car.
1. voltage at battery not running 10-12 volts
2. votage at battery car running 13-14 volts
if all is well - you may need to reset computer / replace computer.

Posted on Mar 25, 2011

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Battery light comes on while driving. Immediately after water pump/timing belt replacement. Replaced battery and alternator tests good. Intermittent battery light remains?


It sounds as though the belt may be slipping or is not tight enough?

If it's a toothed belt it won't slip - it may not be tensioned enough where it goes around the alternator pulley. They are adjustable.

A smooth non-toothed belt can slip.

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The most common reason for the battery light is a worn drive belt. Over time, the belt becomes slick and doesn't "grab" the alternator pulley as it should, thereby, not sending the full charge back to the battery. Check the drive belt for cracks or slick spots as well as tightness. A loose belt will cause the same symptoms as a worn belt. If the belt is good, and is tight and you still have a battery light, you may have a bad alternator. There are many service stations including some auto parts stores that will do a free electrical test on your vehicle. Best of luck!
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Sounds like the belt is slipping and the battery ligt comes on, can this be due to alternater bearing failure? The car continues to start for now


If it is alternator bearing failure you will hear a very high pitched whine from the alternator as it is revved, furthermore it would not usually cause loss of charging until it was nearly wrecked.
It is more likely to be belt failure. Replace and correctly tension the belt first.
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

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When that light comes on, it is indicating charging system problem which could mean alternator not charging for one reason or another like loose belt, faulty alternator, or yes, bad battery or connection at battery, for example. First & easiest thing to do is check all your connections to battery, which you've probably done, and make sure they're tight & clean. Make sure belt driving alternator is good & tight, and in good shape. Now boost the vehicle to get it going & test voltage at battery, after you take cables off. My guess is in your case, the voltage will begin to go down, indicating a bad alternator, that will need to be replaced.

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