Let’s both scour the forum for the best alternator. I tend to want excessive overkill in parts for my 07 Tahoe!
Always open for suggestions from my friends!
to me the best alt is the oem 220amp direct bolt on. part number 13536552. can be had used off ebay with low mileage for under 100$ or any auto parts store.
the corvette guys love the high priced mech man stuff, I'm not a fan. they seem to have a high fail rate to cost to me. and unless they have updated, the new gm alt is a better design to start with. they call the regulator a hairbrush style if you want to Google and research it.
personality, it seems weird to me to not run both batteries thru the current sensor. is there a setting somewhere in the code that uses different math when it has a rpo code for a 2nd battery factory? maybe it knows only half the load is going thru the sensor?