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When I first got my running I too was blowing fuses, but a different one (#6). I was losing the taillights. Finally tracked it down to the taillight sockets themselves. The wire contact had pushed itself through the socket and was making contact with the taillight frame when I hit a bump, shorting out the circuit. You might have the same thing going on, but with the turn signal/brake element. Fixing it was easy. I just slid the contact back and packed a piece of foam rubber between it and the frame part.
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