I read the thread but cannot seem to find it. Basically on some trucks (pre-05 I think) there is a wiring harness that runs on the underside of the AC compressor (on the passengers side). You need to crawl under the engine to see it. There are 2 harnesses down there and one of them rubs and can cause problems if the insulations is damaged. I just re-routed it and slipped some small split loom around the wiring to prevent any damage.
If you can't find the thread let me know and I'll take some pics of mine.
Good Luck