Tiz, I don't think it's even worth the effort. I have 7 pins off the truck and 4 pins to the trailer. Had a problem last year, went to a trailer dude, he fixed it up, took him less that 10 minutes, charged me nothing. I asked what it was so I'd know for the next time and in my case, all it was was that my truck has a different wiring sequence to the trailer.