Got the heater core fixed. NOW my electrical gremlin is back. No front right marker/turn signal and no brake lights. I have replaced both turn signal pigtails. I actually am chasing this problem. First one side then the next. Repeat. Now the brake lights are out. Am I looking for a bad ground? Unfortunately I am red green colorblind so electrical isn't my strong point at all. Any suggestions? I'm real close to taking it to a shop and paying them to fix it. Its seriously getting very old. I enjoy working on the truck but not the same thing over and over. Ugh. Almost enough to make me want to sell it.