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Message: [QUOTE="Bald-N-Blue, post: 35497, member: 1129"] I've seen that exact thing happen on my truck, on the same connector even. I've reworked several harness's a while back to try to figure it out, and as far as I can tell it's a result of oil and/or fuel soaking into the harness and connectors. Add some heat and time, and the rubber and plastic components basically turn to jelly, and I haven't seen a harness yet that hasn't been swimming in oil or fuel in at least a few places. I also found damage to the insulation on most of the wires at my driver side UVC connector, on the outside harness connector. Turns out I had a leak in a fitting on my reg return fuel system hose, directly over the UVC connector. I've got some pictures of it somewhere, I'll post them up when I can figure out where I saved them. The insulation on the injector signal wiring just peeled off with my fingers. Even where the plastic loom looks clean and dry, once I tore the whole harness apart, I found about 90% of the entire wiring bundle totally soaked in engine oil (turns out I also had a "small leak" on a HPO hose for a while :cursing:). At the very least, pull the loom off the wiring bundle around around the connectors near the IPR and the fuel filter bowl. If you find a pool of oil in there, pull it all apart until you find dry wiring. Clean any oil or fuel off the harness with denatured alcohol or electrical contact cleaner, and take a real careful look at the insulation on the wiring and the seals around the connectors. Then you can decide what to do with the harness based on it's condition, and how crazy you feel like getting with repairing it. I've thought about writing up an article about inspecting and repairing these things, if you guys think it would be helpful I can probably get something together in a few days. It's not too terribly difficult to do, but there are a few pitfalls to watch for due to the high voltage and frequency of the injector driver system, and the high current of the glow plug circuits. Anyway, I hope this was helpful, let me know if you have any questions. I promised to contribute more in here, instead of lurking around in the shadows like I did at PSN :lookaround:. :D [/QUOTE]