Quote:
Originally Posted by Effduration
I am trying to fix something similar in my '05 3.0 (6cyl). I don't know how old my My OEM Valeo alternator is, but it puts out 13.1 - 13.6 volts when driving, but only 11.7 -12.2 volts when stopped at a light.
I already changed the voltage regulator in the back of the alternator. I am now replacing the whole alternator with a new Valeo one (not rebuilt).
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Update: My new (not rebuilt) Valeo 140 amp Alternator seems to have solved my problem. I am getting a steady 13.7-13.8 volts at idle and while driving as measured by my cigarette lighter volt meter.
I am a little surprised replacing the voltage regulator on my old alternator did not fix this issue. The voltage regulator was pretty well worn with uneven bushes.
Let's see if we can help OP with his issue.