Brick67

All...I'm new to the forum and need help researching wiring harnesses. I am active duty USAF and stationed in Guam. Bought a '03 Jeep GC Laredo 4.0L and discovered the wire harness coming off the relay box after the split is cut up/re-wired. I have a ton of indications but I think most are ghosts due to this shotty re-wire job. I could use some help with a good nomenclature and part number to search for and or purchase a used replacement harness. Can you help me? I want to say these harnesses are possibly interchangeable within '00-'04 models. I found one on Ebay from an '04. Just trying to make sure I'm about to buy the correct part...Thoughts?