just replaced yesterday but the battery light stays on evereything works fine
The light would be indicating that it is not charging, it is usually one of two things, loose alternator belt, or bad alternator. First find your alternator, and check how tight the belt is. Try to turn the pulley with your hand, try to make it slip against the belt. If you can make the pulley slip, it is too loose, and you need to tighten it. The at home test to see if your alternator is charging, is to remove the ground terminal of your battery while it is running. If the idle is good, and the engine dies, that means the alternator isn't charging. If the engine continues to run with the battery cable off, it proves that the alternator is charging. Try these things at home, then drive it to an auto parts store that does free charging system tests, but make sure the alternator belt is tight first.
Get a voltage test at the battery should be 14.5 volts when running if it isn't the something isn't working. Sounds like the alternator needs replacing , take it back to whom you have bought it off, if it's used you might be a while finding a good one.
