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I didn't find the post mentioned, but I did find this: Chevy Cruze regulates voltage to boost fuel economy - Autoblog

Realistically, I think you have two options: Make the new alternator respond to the BMC's commands, or find someone who can "tune" that function out of the system.

I'm about to buy a HO alt for my 2012 chevy cruze eco. I believe this company has a selection so that I can avoid running into the same issues that OP here is having.

"EXTERNAL REGULATION (MANUAL 13V-20V):
○None
○+$130.00 EXTERNAL REGULATION-MANUAL 13V-20)
"

Should I select none?
Or do I need to pay the extra 130$ to avoid the same problems as OP
 
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