JeffWarf

I was wondering what the wiring harness does to help the electricial situation on a 2020. <y secondary battery keeps going dead after about 40minutes, chevy forgot to install harness so took it in to have it put on. But I dont think it would help? It says it helps only with black out on the center screen. But Boss says it will help with battery issues? I have the dual batteries with the 220 alternator without the second alternator, maybe that was a mistake.