Hello all, My brother in law had run into a road block on his project build. It is a 89 d 250 4x4 reg cab. Standard. He has put a 93 12v cummins in the truck. Has is running and driving but has a bit of a problem. He cant figure out why the lights do not want to work. He has the clearence lights and head light's working to a good degree. But the tail lights and turn signals wont work, they only light up when you hit the turn signal switch. We also cant grt any of the dash lights on. Replaced light bulbs and everything, replaced the switches and some bad wires. But no change. We have tried search all over the web but cant find a 89 wiring diagram. Has has one for his 91 dodge, but they are different. If anyone has one i would greatly appreciate it!