Posts: 1
Joined: Sun Nov 18, 2018 4:12 pm
Delivery Date: 18 Nov 2018

Re: 2018 LEAF Horn Upgrade DIY

Sun Nov 18, 2018 4:55 pm

Personally I would not install additional horns to existing wiring without a 12 volt relay wired to the battery. Will soon be installing 3 new AC Delco horns wired to a relay, triggered by the stock horn wiring. Have done this to previous vehicles, including a motorcycle. The 3 different toned horns produce a diesel train sound. Loud and awesome. These are the same horns used on a 1996 Cadillac Deville. Each horn draws 3.5 amps (11 amps total). Instead of accessing stock horn, hope to identify and trace wiring from fuse or horn ring? Place a switch at that location to be able to switch between stock and the 3 new horns. This way when inflating the tires I can switch it to stock and not go deaf when reaching the proper psi. I have yet to have to inflate tires but read that when reaching proper psi the horn is triggered. The horns are AC Delco D1922C, D1923C, and D1925C, which produce a F- low, D- super low, and A- high note. Available at any online auto or amazon or Walmart. If you love an attention getting train sound that takes up little room, and draws very little power, this is it! Will provide details on install after completion.

Posts: 1
Joined: Wed Dec 05, 2018 7:06 am
Delivery Date: 05 Dec 2018
Leaf Number: 310920

Re: 2018 LEAF Horn Upgrade DIY

Sun Dec 16, 2018 6:53 pm

Hey OrientExpress, thanks for the great write up and photos. My girlfriend was kind enough to let me perform this upgrade on her new leaf. Only having the vehicle for a few weeks, I had too many close calls when driving with the embarrassing horn.

I opted to go about the mounting in a slightly different location, but was able to take a lot of great ideas from contributors here to put together a really solid upgrade. I'll include the links for the stuff I purchased on amazon. Generally I didn't have too many of the electrical kits, so I ended up spending a lot more on those items, but I'm glad I have them now.

Horn - ... UTF8&psc=1
Wire - ... UTF8&psc=1
Connectors - ... UTF8&psc=1
Wire sleeve - ... UTF8&psc=1
Shrink tube - ... UTF8&psc=1

I purchased these plastic tools (plastic snap tool is metal) for another project. I can say they have come in handy for projects like this. I would highly recommend them to anyone looking to work on their car.

Tools - ... UTF8&psc=1

I can't figure out how to post my images from my fix, but I'll try to work that out. Thanks again everyone!

Posts: 1
Joined: Wed Dec 26, 2018 5:23 pm
Delivery Date: 27 Dec 2018
Leaf Number: 304895

Re: 2018 LEAF Horn Upgrade DIY

Wed Dec 26, 2018 5:34 pm

Hello. I just recently purchased a 2018 Leaf and joined this forum. I found that the stock horn was anemic and appreciate your write up as it provided a lot of useful information. There is one correction that needs to be made. A pair of Hella Super tone horns draw 14 amps, which is far more than 18 gauge wire can support. Hella recommends that we install a relay, which is how I did it. The main power from source to the relay should be 12 gauge and have a 16 amp fuse per Hella. The positive wire from the relay to the horns can be 14 gauge. Since I bought a roll of 12 gauge for this job I used it. I also used the same gauge to ground the horns to the chassis. There are two more spades on the relay and these get connected to the original horn wires. 18 gauge is sufficient for this as it merely provides a signal to the relay.

You might be able to get away with running 18 gauge from the original horn connectors to the new horns if your honks are short but the horns will not be able to draw the current they are designed for and will not be as loud. There is a risk of overheating the conductors and a failure in the harness would be a real drag.

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Posts: 1291
Joined: Sun Aug 08, 2010 12:22 pm
Delivery Date: 10 May 2011
Leaf Number: 2331
Location: San Jose, Ca

Re: 2018 LEAF Horn Upgrade DIY

Wed Dec 26, 2018 5:42 pm

I’ve been installing these Hellas since 2011 in LEAFs and never had an issue.

You are more that welcome to over think the install, but my method is solid, and and proven in lots of LEAFS both gen 1 and 2 that have them installed as shown. The worst that can happen is if the wiring is installed without regard to a floating or chassis ground, and that will just pop the fuse.
2018 LEAF SL
Gun Metalic
Delivery April 10 2018

Prior LEAF:
2014 LEAF SV
Ocean Blue
Delivery May 23 2014
50,000+ miles - all 12 bars - Same range as new - No warranty issues ever!

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