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no idea...I tell folks all the time to pull 12v off the rear battery and run the 14v tap so no issues of imbalance for accessories ...th400 and 4L80E....never had an issue

as I stated in my post....I always ran the ground strap on TH400 equipped trucks, as that's what the MWO said to do. but 99% of my builds are 4L80E. the 14v tap is run to the rear battery POS terminal...to make it simpler.

I have no idea why they ground it...I've never been able to get an answer that made any sense. here is all I know...that lead is supposed to be run to the rear battery on 4L80E equipped trucks to prevent an imbalance from the draw the 12v TCM creates on the rear battery, this 12v's charges the...