Hi,
I have a 96 Intrepid, and my rear defroster is not working. We are trying to find the feed that will power the back window. Does anyone have any advise

Normally, it is a 30A fuse, located in the under hood fuse box. Also, remove the connector to the rear defroster and clean with abrasive cloth; afterwards, apply dielectric grease.

There is a fusible link directly off the battery that powers that circuit.
Make certain that you aren't getting power directly at the rear window defroster.
There are far more prone the wire coming loose right at the defroster grid and also suspect would be the ground circuit.
If you've got power at the grid, follow the ground side and make sure it's clean and secure.

This link may provide additional help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-11.html#post2138426