Does anyone have information on this problem. I have a 2008 GMC Duramax Diesel with 253,000 miles on it. Rather suddenly it will not start with no power going to starter. Neutral switch rely is good and has been tested. Power going into relay is not happening as the fuse for the starter blows as soon as you turn the key to start. Batteries have been tested and they are at 100% All electrical is working when you turn the key to accessory. I have seen videos on bypassing the starter fuse to start the engine by jumping power to the neutral safety switch but trying to get more information before trying that.