Might help if you say whether its an S13 or S14.
Did you have power to the back of the car before the install of the harness? If so, I'd imagine something is unplugged from the fusebox that shouldn't be.
Looking at the fuse box cover for an S13, it looks like there is a fuse for the tail lights in the kick panel fuse box. I'd start there. Are you getting power to that fuse holder location?
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