where is the main wire harness that goes threw the firewall located in a wj 2004

 

Seems like nobody knows, sorry about that.

 

Try looking at the drivers door-feeding down some half way down the page is where someone else has had some problems with the electrical system this might help you too copy and paste the below url removing the word (dot)
https://www (dot) cnet.com/forums/discussions/the-famous-jeep-grand-cherokee-electrical-problem-272172/