M&H produces harnesses that are EXACTLY like the factory harness - same connectors, same wire colors. You can use your factory wiring diagrams to diagnose issues. Be sure to call M&H before buying - they don't sell direct, but they are the most knowledgeable in finding the correct harness, whereas their distributors are not good at this...
It seems they only sell through YearOne, so you pay big mark ups. Wish they didn't have this "exclusive" deal with them on Chrysler harnesses. When you say finding the correct harness, aren't they just sending you to YearOne?