Hello, Has anyone used a Jim Carter harness and if so what's your opinion. My truck is a 48 FC253 1 ton. I searched this to the best of my ability on this site without getting my question answered. Plenty of stuff on others for Chevys. I know there are small differences between GMC and Chevy and Jim Carter is the only one I've found so far that lists them specific even though priced the same. So the main questions are is it a quality product and are the instructions any good. I am a little intimidated on taking this on so will need good instructions. Thanks