2004 (early '04) Chevrolet Silverado K3500 6.6L Duramax diesel dually. Truck started blowing black smoke but seemed to be running fine, no skipping, bucking or hesitation. I only drove it about 80 miles to get back home and parked the truck. When I went back to troubleshooting after 5 days the truck is completely dead. Electronic key entry, all cabin lights, all dash lights, brakes go to the floor, everything!! Batteries read over 12V. Checked all grounds, clean and tight. I would like to troubleshoot as much as I can to avoid paying for hours and hours of tech time at a shop.
