My 2003 Ford Expedition


Asked by Jul 26, 2016 at 09:55 PM about the 2003 Ford Expedition Eddie Bauer 4WD

Question type: Maintenance & Repair

Hello Everyone.. my 03 expedition the battery is not
charging and if does it dies asap I just put in a new
battery, alternator, fuel pump and changed the
corroded plugs. What can this be?? Please help..
Thank you for your time :)

4 Answers


Have you run any test on the charging system? Believe it or not but new parts die. I had a new alternator DOA. Went to all the trouble to install and then had to remove it and try another one. I would take it to a parts house that will put a ODBII on it to see if they find anything

1 out of 1 people think this is helpful.

I have an 03 expedition that had the same issue and it was the rear defroster that was the cause. Took my mechanic 3 days of searching to find it. Easiest test is to remove the rear defrost fuse.

1 out of 1 people think this is helpful.

If you install an alternator yourself and you have a dead battery, you will almost automatically blow out your diodes in the alternator trying to recharge a dead battery. Charge up the dead battery first with a battery charger, THEN install your new alternator. I've seen this happen too many times before. Also disconnect the battery before hooking up the wires to the new alternator or you can short it out instantly. This may be what happened. Also like another reader mentioned, Rebuilt alternators can be junk from the start. Always buy a remanufactured or brand new alternator, not a cheap rebuilt unit. Many rebuilders only replace the parts that are bad at the time of rebuild so you're basically buying a used alternator with some new parts. Buying new or reman guarantees a completely new inside alternator. Good Luck, Kenny/MrBlueOval

1 out of 1 people think this is helpful.

Thank you very much for all your help everyone that has replied to my question.

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