Every thing works in my fuse box but the accessories and stereo. No power at the fuse box for them. (89 Jeep Wrangler)

I would start at the ignition switch as thats where the power comes from to power up the fuses for these components, there are power wires from the engine compartment that come throught the dash in the center or rather come through the firewall, i belive its about 4-6 wires with a connector plug under the center of the dash, the connector heats up and causes a bad connection,start by located that first then check the postive side of the battery for a bad power wire connection if its not the main power wires that i told you about in the center of the dash, you can get to them from the driverside under the dash. let me know the outcome.