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That's not going to be easy. The Cruze is designed such that the BCM is the voltage regulator. What's more, the set voltage changes depending on what's going on. Less when engine power is needed, more when you're braking.

I agree with theonlypheonix that the company should help you deal with this. But I'm pessimistic about internal regulation working. Not without reprogramming the BCM with a custom program so it doesn't worry about the alternator.
 
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