My 2017 Silverado 2500 HD LT 6.0 L suddenly lost all electrical power after running and charging fine. I Replaced the battery, which did not solve the problem. It acts like it has a bad ground somewhere. There is good voltage between the negative terminal on the battery and all the positive terminals on the connection block mounted over the battery. I found two engine block and one chassis ground connections and all have good continuity with the top end of the negative battery cable. I currently have no power to the entire truck, not even a click when I try and start it. Is there another ground I missed, like a body ground?