Question about 1999 Ford Expedition

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The battery light on our expedition was on so we replaced the alternator and then the battery, and the new battery is still dying. What could be wrong? Thanks

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There is a fuse in the black fuse box under the hood that runs the alternator field. It is a 20 amp fuse. Black box is located by the master cylinder by the firewall.

Posted on Aug 16, 2009

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YOU MAY HAVE A VOLTAGE DRAIN IF ALT LIGHT IS OUT NOW AND BATTERY DOESN'T HAVE A BAD CELL. TEST AT POSTS,SHOULD HAVE 14.1-14.4V CHARGING. MAKE SURE NO FUSABLE LINKS ARE BLOWN EITHER. GOOD LUCK!

Posted on Jul 19, 2009

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1 Answer

I have a 2004 Eddie Bauer expedition the charge light started comin on then truck ended up dying bought new battery charge light stayed on then not even 5 hours it was dead again changed alternator and the...


Have someone check the charging system on the truck. The light comes on when the alternator is not charging the battery.
Could be a wiring problem between the alternator and the battery.

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I have the same exact problem. First thing I did was replace the battery. Still having problem. Alternator charges then, an hour later the battery is dead. I was at a stoplight and suddenly the air amd radio quit for a couple of seconds, the volt meter hit bottom, then kicked back in and everything worked again. Turned the car off, started it back up. Parked, went inside, came back out, battery dead. New battrery, Good alternator, could it be the regulator shorting out? do they have regulators anymore?  

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Go to Autozone or Oreillys for a free scan. You would need to catch the voltage before it goes across the battery to know how much the regulator is sending to the battery. If the battery is that bad you are only measuring battery voltage and not alternator output.

Since most regulators are inside the newer alternators you will need to physically open the alternator to replace the regulator or buy a new alternator. If the battery is rapidly dying you are probably correct about the alternator. Usually a battery at 10 volts will hold 10 volts when it is getting a 14.2 volt boost to its good cells. Not drop like yours is doing.

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i had a similar problem with my 2000 ford expedition. After 3 new alternators and a new battery i figured out it was a 20 amp alternator field fuse blown located in the under the hood fuse box. Good Luck!

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1 Answer

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Get the battery tested first, then the alternator belt for tension and finally the alternator charging rate output is OK.

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you should remove your alternator and take it into an auto parts store and they can test it for you.
this alt had an internal regulator which can be replaced easy.
your auto parts store will be able to full feld your alt to bypass the regulator. this is how you test it to see if the regulator is bad.

you didnt say how many miles are on this truck .
most of these ford alt will last 120,000 or more
on the back side of the alt you will see the replaceable regulator.
516c5a3.jpg

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If he replaced the battery that would have cleared the code. There is another issue. Was the alternator aftermarket? Just becuase it is new does not mean good. Those are easy to install I would return it to where you got it and try another.

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