[cj847]

So, the fuse blows when you use the brake and the turn signal and does not blow when you use the flashers? Need to confirm that the flashers don't blow a fuse as it is a separate circuit. If the flashers blow it, it is more likely in the taillight wiring.

Assuming the above is true, the only things it could be are:

-mis wired or shorted at the steering column multi connector (likely) This is easy to mix up. Check page 84-87 of instructions.
-defective/mis wired brake switch.
-short in the column (not likely since you've tried 2 switches)
-defective blinker switch (not likely since you've already tried 2)
-defective/mis wired dome light switch (that is the only other thing on the circuit).

PS> Do the blinkers work until you hit the brake?