I have a 91 crx with a si swap. It was done before I bought the car. I have power on all of my fuses undr the hood, but no power in the fuse box inside the car. I already bought and replaced the main relay and that is not the problem. Any ideas? Are there any fuses that I am missing? Thanks

Your ignition switch and harness are bad. Here's how to replace it:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-2.html#post224652

This will restore power to the under dash fuse/relay box. Wear, pitting, or melting has taken a toll on the switch. Easy job.