The ECU does the regulation, good point on the battery temp sensor, it sits under the battery in the battery tray, check that first but a brand new alternator should be less that $500 fitted, a reco unit should be a couple of hundred less also fitted.
I have some spare used and working pre-update alternators, I don't know if they are the same for your model though, I guess I can look them up and see if you like...
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JJ
Do it once, Do it right!
2014 WK2 Overland
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