I'll second the suggestion to check the brake lights.
Also, there are several separate green wires connected to that fuse. It
might help to disconnect them one at a time, to at least identify which area
the problem is in.
Another technique that I find helpful is to temporarily connect a headlight
bulb in place of the fuse. If there is a short, the bulb will light
brightly; but it should pass enough current to light the brake lights with
the headlight bulb glowing only dimly if at all. If you run the leads out
to where you can see the bulb while driving, it can show exactly when the
problem happens.
Or another approach is to use one of these:
http://goo.gl/IzSRY
in place of the fuse. It will at least keep you from having to repeatedly
replace the fuse, while looking for the problem.
-- Randall
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