I have a 2000 ford expedition new battery and alternator but the battery light is on and the headlights want come on and the ac and radio go on and off

SOURCE: headlight bulb replacement

it should come out of the back of the housing just turn it one way or the other and pull it out or there is a keeper holding it in

SOURCE: 2000 Ford Ranger Alternator

have the alt tested there not very good do you have 12 volts going to the big wire on the alt and with key on you should have it to a small wire going to the regulator to turn it on

gord storey

• 477 Answers
• Posted on Jun 03, 2009

SOURCE: 2003 Ford Mustang GT Battery Light

Your alternator should power everything when engine is running. Battery is only for start up. Test voltage with a multimeter when engine is running , should be 14V or more . Any less indicates low alternator output.

SOURCE: battery light on

You may have to run another hot wire from the back of the alternator to the battery direct.
Use 10 or 8 guage wire.

SOURCE: The red battery light on my 2001 Ford Expedition

The alternator change is not that difficult. I would take the vehicle to an autoparts store and have them test the alternator output. Check the battery cables and make sure they are clear of corrosion and are tight. A parts store can also test the condition of the battery. Most parts stores will check the alternator output and battery for free. If you visit the autozone.com website, you can also register your vehicle information and have access to an online repair manual that will show the procedures for changing the alternator if it is necessary. Sorry for your trouble and I hope this helped. Best wishes.