My 2007 yamaha v star 650 keeps blowing the fuse that goes to the turn signal brake lights and horn

There seem to a 'live' wire (in the turn signal, brake light or horn circuit) touching the frame of the bike and thus the fuse blowing.
You will have to trace out the short-circuit.
You can start wth removing the connections to the turn signals thn fit the fuse and see if it still blows ....like wise remove the wire to the brake light and thn check if the fuse blows, same to the horn.
In short ..you can remove all the wires connections to these and thn fit the fuse and refit the wiring connections one by one ,where the fuse will blow after connecting the wire to say brake light thn the problem is at the brake light wiring ....likewise to the others ...onces you identify the circuit tht has the problem thn it will be easy to trace it and rectify it.
Hope this helps!

Sounds like you have a wire shorting out somewhere. start with the wire harnesses that are around the steering fork areas fist especially the one that comes from your handle bars because that's where a lot of twisting and chaffing start...hope this helps!