I changed new alternator , I check the battery is good and also I changed new belt and is good tight. And the light battery in the dash is still on , please what can I do to turn the light off, I don't know where is the fus for the battery . My expedition is 2001 motor 5.4 Eddy Bauer Thank you for help me Arturo Alba [email protected]

if it squeals, the belt is not tight

the red warning light comes on when there is low charging voltage test for charging voltage between the alternator and battery should be roughly 14 volts

If the light is on when car is running, the alternator is still not working. Check your power distribution center near the battery for any fuses out. Maybe there is an alternator fuse.
Is your battery good? A completely dead battery may not take a charge from the alternator. It needs to be charged off the car. Have it load tested at a parts store to see if it's good.
Is your alternator belt tight? A loose belt won't let the alternator work to capacity.

BATTERY LIGHT ON MOST LIKELY THE ALTERNATOR DONE.CHECK DRIVE BELT FOR TIGHTNESS CHECK BATTERY CABLES FOR CLEANESS AND TIGHTNESS.CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR BATTERY PLUS FEED WIRE.MAKE SURE GETTING GOOD 12 VOLTS THERE CHECK FOR LOOSE OR DAMAGED VOLTAGE REGULATOR WIRES.

first check connections on battery and alternator make sure tight clean and there is no damage or breaks also check belt is tight and not slipping or damaged the battery light can mean battery not charging or alternator not putting out a charge if a boost got u home i would lean towards alternator problem [have tested though as well as battery most auto stores usually offer this service for free ]

SOUND LIKE ALTERNATOR PROBLEMS CHECK BATTERY CABLES. MAKE SURE THEY ARE CLEAN AND TIGHT.CHECK DRIVE BELT MAKE SURE ITS NOT LOOSE OR DAMAGED.IF ALL LOOKS GOOD CHECK ALTERNATOR VOLTAGE OUT PUT AT BATTERY WITH CAR RUNNING.BATTERY VOLTAGE SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR IS FAULTY.

First off check the fuses under the dash. And make sure battery terminal connections are tight and clean.Check for proper tension (roughly 1/2 inch of deflection) on Alternator belt and that belt is present.Sounds like there is a alternator issue.Did your battery light come on while driving? Have a friend jump start you (follow safe jumpstart procedures or you could damage your friends car or yours ie:Ignition key off,Postive cable goes on first when attaching cables,negative cable comes off first when discconnecting cables. Let charge for 15 min or so before trying to start your vehicle ) If it starts look for a battery light on the dash. If no battery light is on then alternator is probably ok and battery is bad (take it out and have it tested at your local autoparts store). If the light is on then you have an alternator problem.To confirm alternator problem check output voltage across battery terminals. Should be min 13.5-14.5 no more than 14.5 If you have to replace the Alternator make sure battery is good and has a full charge and negative batt. cable is disconnected,if not you could potentially ruin you r new alternator

Hi Richard,

Check the belts, specifically the one attached to the alternator. It should be tight.

Next, if you have a volt meter, check the battery with the ignition off. It should be 12VDC.

Start the engine, check the voltage again. This time it should be at least 13.5VDC.

If there is no difference the alternator may need to be replaced

Best regards,
Mike

Try disconnecting battery for about 10 mins. or have vehicle scanned and codes cleared

Battery doesnot get charge due to dead alternator or loose serpentine belt. If you in US go to nearest Autozone store and check the battery for volatge and alternator for charge. If both fine check the serpentine belt if it is tight enough
http://www.ehow.com/how_2279100_check-serpentine-belt.html?ref=fuel&utm_source=yahoo&utm_medium=ssp&utm_campaign=yssp_art
If it is fine check the connections of alternator and battery for corrosion. Corrosion can increase the resistance and decrease the electrical current
Please kindly let me know if you need more info
Good Luck