Thread: Possible to change the set alternator output voltage?
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Old Sat, December 18th, 2010, 04:06 PM
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Originally Posted by XPerties View Post
As we know 04+ and up alternator output are controlled by the PCM but correct me if I'm wrong, wouldn't it be easy to change this during a custom tune tuning?
If in fact, it is controlled by the PCM, I'd think you would be right. But this is the first I've heard of the PCM controlling the voltage of the alternator. Where did you learn this? It really sounds counter-intuitive to me. Voltage regulated alternators are pretty simple, and I don't see the advantage of adding another layer of complexity in the charging circuit.

Now, monitoring the alternator voltage is an entirely different matter and I'd expect the PCM to do that so that it could warn if a charging defect occurred.

- Jack
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