Replacing the stock horn to Fiamm Twin Horns

Source :  http://www.electricvehiclewiki.com/?title=Replacing_the_stock_horn 

The stock horn has two male 1/4" spade connectors, which connect to two corresponding female connectors from the wiring harness. One female connector, on the long wire from the wiring harness, is the negative lead; the other female connector, on the shorter wire, is the positive lead. (The female connectors have a nub that you need to squeeze to disconnect.)

If your new horns come as a pair, connect them in parallel: connect their positive terminals together and then to the positive lead (shorter wire from wiring harness); connect their negative terminals together and then to the negative lead (longer wire from wiring harness). This means that, for Fiamm El Grande horns, you need two 'Y' leads. Each lead has one male spade connector to two female spade connectors:

The Fiamm horns' mounting bolt is also its negative terminal. The kit should include washers that has a spade connector on their perimeter; the washer goes on the bolt and its spade connector provides the negative contact point. The single male spade connector on the horn's body is its positive terminal.
The horn bracket's bolt is 12mm; it is torqued to 13 ft-lbs.


An alternate method of mounting is to mount the horns to one side , so as to minimize blockage of air flow through the radiator.

Method 1: From Bottom


Remove the forward underbody panel to get at the horn:

Full Tour of Leaf Underbody. click here...

• It's almost as simple as plug and plug.There are two quick connectors on the stock horn.You un bolt the old horn.
• Pull off the quick connectors.
• create two wires shaped as Y's, the top legs of the Y need 1/4" female quick connectors and the bottom needs inline quick connectors.
• Snip off the stock 1/4" quick connectors and crimp the bottom inline quick connectors to the snipped off stock wires.
• Now you will have (4) 1/4" Quick Connectors to connect to 2 horns, two connectors will be positive and two will be negative.
• Don't mixed them up. 
• Cover all exposed wires and quick connectors with electrical tape and you're set. 

Method 2: From Above


You can replace the horn from above. This involves removing the radiator's cowl and the coolant expansion tank.

To see full pictorial tour, Click here...

• Open the hood and remove the front bezel that covers the radiators. 
• Get the coolant overflow tank out of the way.
• You can see the stock horn

There is a foam block and lots of stuff in the way of top access on 2014 Leaf. Also the panel does not easily come off anymore.

After took the top plastic cover off there are additional plastic covers that block your access from getting to the horn from above. See this picture, click here...