I have a 99 Windstar and when my mechanic replaced the alternator the battery light would not go out he took back about 2 alternators, stating that the alternator was not good, because the battery light stayed on. Finally, he had the last one he put in tested and it was fine, but the battery light still came on. He called a Ford mechanic and they said you have to use a ford alternator, because the computer can not recognize other brands of alternators. Once he did the light went out. He said occasionally it will recognize an off brand, but when it doesn't the battery light stays on and it can cause problems with the computer, and I believe he said the cyliniod could burn out. He just bought a re-built alternator from the ford dealer for about $199.00
alternator is not charging battery, or loose - corroded connection on battery cables
Replace your alternator
Sounds like battery/alternator problems. Check battery first, it's cheaper to replace.
Either check your alternator or your battery life and replace as see fit.
The alternator needs attention or replace
1. Alternator charging system malfunction.. [not charging enough]
Battery is not charging due to defective alternator or the battery itself needs to be replace.
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 alt. You may also have a battery drain (something that is staying on and killing the battery)
its the alternator if the car is running with a battery light on. but check fuses first
replace the alternator
yes if one of the wires was getting an earth from the alternator cover or rubbing off the engine the battery light is really an alternator light warning you that the alternator is not charging the battery
My lights were coming on when my alternator was going out. Test your alternator and charging system and replace accordingly.