I recently have had problems with my 05 lly. Last week it was down for 5 days wouldn’t do anything. Finally found out that I needed a better add a fuse under the hood for my fass fuel pump. Well anyways. Drove it for a week. Started fine. No rough starts no codes no problems. Monday comes around drive it into work fine. End of the day truck won’t fire. It won’t do anything. Everything powers up, all fuses are fine. Both batteries are good. Starter is new. But I’m not getting 12v at the starter. Where should I start? I’m having trouble finding the solution it’s been 2 days now tracking down wires and pulled electrical connections apart. Any help would be great, thanks