Battery light comes on while driving in my 2003 ford escape but we tested the voltage and it is good on both the alternator and battery. What else could it be?

Check the alternator fuse,make sure all wires on alternator are in the right place, have auto zone check your alternator,

You may have an alternator that is getting ready to go out. Have you noticed a whinning sound that increases / decreases with engine speed? A diode going out in your alternator will sometimes produce a whine and will reduce the voltage produced, eventually not keeping your battery charged.

Take car to an auto parts store for alternator check. Many stores will perform this test for free.

Good luck!

was the voltage regulator checked

yes , repair the alternator

I was just reading on another forum about the Ford Escape Battery lights staying on. They said it was the overflow reservoir being low. My 2003 Ford Escape XLS battery light has been on for 6 months. I went to autozone last Wednesday and they said my battery was bad. I got it replaced yesterday. Battery light still on.
So tonight after I read the other forum, I figured it would be worth checkng. My reservoir was about 1/2 inch below the full line. I filed it about 1/4 inch above the full line.....lo and behold, the battery light went off when I started the car. How freakin stupid. But there is your answer.

The battery light indicates insufficient voltage. I would recheck all the battery connections to be sure they are clean and tight. I would also have the alternator output tested, since the light will come on if the alternator is not providing sufficient voltage to keep the battery charged. Take the vehicle to an autoparts store and they will test the battery condition and alternator output for free. Sorry for your trouble and I hope this helped, Best wishes.

The light indicates that the battery is receiving insufficient charge voltage from the alternator. Take the car to an autoparts store and have the alternator output checked. Most parts stores will do the test for free. Sorry for your trouble and I hope this helped. Best wishes.

most likeley needs an alternator.not very easy to chang on that vehicle. hope this helps, good luck.

check the alternator, voltage can not drop below 13 volts,also test battery and all ground connections

This is a problem with the alternator. Diode rectifiers and voltage regulator replacement will give this baby a 14.2 voltage output. In this 3L V6 SUV removal of the alternator requires removing the right tire, the right axis and undercovering to reach the 6G alternator. It is a 133mm rectifier with a motorcraft, The serpentine belt is better removed from the bottom. Also keep a bucket on hand to recover the oil from the transmission.