Man! This is tough. So the other day I'm driving my FJ Cruiser and the vehicle starts to hiccup and won't accelerate. I noticed right away that my battery voltage is depleting quickly. After about a mile of driving my truck completely dies. I get the truck towed and I replace both the alternator and the battery. I start the truck and let it idol for a couple of minutes. When I jump in the vehicle to take it for a test drive the truck begins losing power like before. The voltage gage needle begins to lower again and the my FJ acts like it wants to shut down again. So I turned off my truck, and disconnected the battery.Shaking my head, can anyone help please. What is this?