HELP! Where is the accesory fuse located?

My accesory fuse is blown and i need to find out the location of the fuse so i can change it. I Have a 1990 B2200.

in the fuse box. if you cant find it, buy a simple fuse tester and it will def help.

Going off the Diagram I have the fuse box is on the bottom of the driver side dash, and the tail lights fuse is the top right fuse. It doesn't really have a fuse labeled as "accessory". I agree get a fuse tester or pull each one out to check it doesn't look to be numbered like many other trucks.