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The internal voltage regulator in the alternator is failing. Pretty common for it to charge and then not charge just like you observed. Replacement is in order.
Dont buy a rebuilt alternator from Orilleys. We have had horrible luck with them. NAPA is a lot better!
You already have :-)
When the light comes on and your meter is showing only 11 volts, it means that at that time it is not charging.
It HAS to be between 14-15 volts otherwise the light will come on and its not charging.
Thats the problem with intermittent electrical issues with an alternator...it has to be tested at the moment the light comes on and from what you told me you have done that and if its not putting out 14 volts, its not charging. We replace a lot of alternators on this vehicle that do the same thing and i can guarantee you its a bad regulator inside the alternator!
The charging system is NOT controlled by the computer on this vehicle.
You dont have to take that wire off. Just connect the meter leads to the battery and take the reading there. If it were a wire problem, it wouldnt be intermittent.
Dont even try to take the alternator apart to replace the reg! It will turn into a nightmare assembling it.
Just buy a rebuilt unit bud.
It will solve this for sure.
Take care now.
Upload a pic of the alternator showing where the connector is and the wires going to it please.'