I dont know for sure, try your manual first. It could be in the fuse box next to your battery. If you unclip the lid it should have a diagram on the back. Or it could be in the fusebox thats near the passenger/drivers footwell, again it should have a diagram on the back of the lid. Don't quote me on that because im not 100% sure, but it maybe worth a look. Unfortunately i dont have a zed anymore or else id check.
guide here i found. http://www.cliffshade.com/350zr/350Z_guide-2004.pdf
Click on: Table of contents, No.8, fuses.