No brack lights

i have a 1971 f 100 there is no brack lights everthing els works put a new stoplight switch i can only find 2 fuses under the dash thay are good pls hel

Check the switch near the brake pedal that activates the brake lights.

i put a new one in it did not work

Have you checked to see if you might be missing a fuse? Have you looked under the hood for an additional fuse box?