[AT] OT - Electric horse fence

[Mike]

OK, so my wife rides horses, we bought a house that came with existing 
electric fences that looked like Homer Simpson put them together, they 
were that bad. We put up with them for two years, and this year, we were 
able to afford to re-do them for the paddock area. I'm to the stage of 
running new electric fencing. I put 12.5 gauge insulated wire buried 
under each gate, because I don't care for the kind that you just stretch 
across to keep the circuit live. My question is this. I cannot seem to 
find a connector, crimp of otherwise, to connect the 12.5 gauge wire to 
the 17 gauge aluminum wire that will be used on the rest of the fencing, 
which is 4x4 posts with 5/4 deck boards. Seems like I could just use a 
wire nut, but there has to be a better way. Any insight would be 
appreciated.

Thanks,
Mike M