Electrical is 1 mechman 270, big 3, d3400 up front, 3 deka g31's in the rear, 2 runs postive and 2 runs negative knuconceptz Ofc. The issue with the voltage is with the 2007 Tahoe the altnator shuts of on stock ecu so when the alt is off its drops to 12.2v that's when it meter the 152. When the alt is on lowest it will go is 13.4v. There is 2 battery trays under the hood so I'm going to run the stock alt truck and stock battery. I'm gonna also add an additional 370 with the 270 just for the system external reg so the ecu doesn't cause anymore issues