The Horns & all turn Sigs are on the same fuse as are the brake (both switches), tail & license light. Also, the speedo assy & partially the tach.
The frt running lights are powered by another fuse that also operates the headlight and the tach as well.
Did you isolate the rear fender harness as i suggested in an earlier post by disconnecting the 5-pin connector under the ECU?
Based on your prior response it sounded like you only did a visual 
EDITED: Also, chk you frt brake light switch wiring. I see you installed fwd extensions as well!