Charging System problem

Asked by Jun 27, 2019 at 06:05 PM about the 2004 Ford Expedition XLT

Question type: Maintenance & Repair

I have a 2004 Expedition with the 5.4l V8  that had a battery light on and a
"Check the Charging system" message. We checked the battery and it was
not charging so we replaced the alternator. I am sure we have the correct
one and that did not resolve the problem. I replaced the PCM computer. It
was flashed to our vin and after installed the error disappeared for a minute.
I did a voltage check on the battery with the engine off and the battery was at
12.4 vdc. Started the engine and ran at about 1800 rpm the battery light
came back on and the "Check Charging System" message appeared again. I
checked the voltage on the battery and it was 14.8vdc. Which if I am correct
is over charging. Any ideas why or where I should check next?

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