Just did the upgrade on my 2014 Leaf today... DEFINITELY go at it from the bottom!! I was able to get there from the top, but it is much more difficult that the original (very well done) instructions indicate.
It worked though, and I only bled a little...
I have the 2014 Leaf S, and already have the FIAMM el grande horns ordered from amazon. if you go from the bottom does it have the crush panel as indicated in this post? I did try and look to see if I could do it from the top but it appears that it is different from the original DIY as others have indicated.http://sfbayleafs.org/technical/diys/leaf-horn-upgrade/
Also, regarding the wiring, it's confusing based on others posts. Some are saying that wiring is included but I didn't get any. I also looked at the instructions included but I think they are for people that can read it properly, I can't understand exactly how to put it together and how the stock wires are/are not used.
Do I just go buy some extra wire or do I have to buy an entire spindle to create the "Y" which I'm not entirely sure how to connect either. I've posted a pic of the horns below, did I even assemble it correctly? That "ground" bolt, is that something I supply from home depot as well? Are the silver spade connectors coming out of the horns the positive? What about the one without a spade connector?Is the gold connectors the ground? It seems like everyone else knows exactly what all this stuff is, but I have no clue. Thanks for your help!