How can you add/install this on an existing motorcycle horn?

Do not understand why you would want too. If your existing system need a relay due to high current draw the mfg would have added it when bike was manufactured. It will not improve your horn or make it louder or change the tone.

How much does the relay draw? not the horn output rating of 80a- the low current input side. (if it's under 10a i can use my existing horn button.)

The relay draws well under 10 amps. I use my horn button on a 2017 Tacoma with no problems at all.

How do you know which relay power cord is negative? And how do you hook that type connector to battery?

As described in the third picture, the blue wire and the white wire on the harness are respectively connected to the positive and negative poles of the horn wire of the original vehicle, the red wire is connected to the positive pole of the battery, and the black wire is connected to the frame.

How do you hook up the button to the farbin horn wiring harness relay kit? thank you.

Connect one line of the button to the blue line of the Farbin wire harness, connect the other wire of the button to the positive pole of the battery, and the white wire of the Farbin harness is grounded to the frame. Thank you for your support!

Farbin Air Horn Relay Wiring Harness 12v 80 Amp Car

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

🔊 Blast louder, install faster, last longer—be heard everywhere!

PLUG PLAY SIMPLICITY - Color-coded wiring harness makes installation a breeze—no electrician needed.
POWER THROUGH ANYTHING - Handles up to 80 amps for the loudest, most reliable horn blasts.
PURE COPPER PERFORMANCE - Premium copper coil and contacts ensure longevity with 10,000+ mechanical cycles.
BUILT TO BRAVE THE ELEMENTS - Composite housing shields against heat and harsh under-hood conditions.
UNIVERSAL FIT FOR EVERY RIDE - Compatible with all 12V vehicles—car, truck, or motorcycle, join the elite horn squad.

The FARBIN Air Horn Relay Wiring Harness is a robust 12V, 80A relay system featuring pure copper coil and contacts for superior conductivity and durability. Designed for easy installation with color-coded wiring, it fits all automobiles and motorcycles, enduring harsh engine bay conditions with its high-quality composite housing. Rated for over 10,000 mechanical cycles, it guarantees reliable performance for your air horn setup.

Specifications

ASIN	B07TN68VZB
Best Sellers Rank	#15,210 in Automotive ( See Top 100 in Automotive ) #30 in Automotive Replacement Electrical Wiring Harnesses
Brand	FARBIN
Brand Name	FARBIN
Coil Voltage	12 volts
Connector Type	Wired
Contact Current Rating	80 A
Contact Material	Copper
Contact Type	Normally Open
Current Rating	80 A
Customer Reviews	4.5 out of 5 stars 221 Reviews
Item Weight	3.52 ounces
Manufacturer	Ruian City Allrey E-Commerce Ltd.
Maximum Switching Current	80 A
Minimum Switching Voltage	12 volts
Mounting Type	Socket Mount
Operation Mode	Manual
Part Number	FB-JDQ
UPC	791313532516
Unit Count	1 Count
Wattage	960 watts

Reviews

B**8

Works great

Needed a replacement for the fabrin horn. Works great same amperage

10.08.2026

D**Z

Producto de buena calidad

Muy bueno y fasil de instalar

11.08.2026

A**E

Cable

Muy buen producto

16.07.2026

P**R

Makes installation much easier for the BadBoy horn

Installed on a 2005 Electra Glide Ultra Classic. I suggest lengthening the 2 wires that go to the horn. The included wires too short.

9.11.2024

J**S

Good stuff

Perfect

4.07.2026

A**B

Nice kit to add a relay where you need it

I used this to add a "hot start" to my 1969 Beetle. Worked great for me, installed under the rear seat. Easy to find wiring directions on the inter-webs to do this mod. Takes the starter solenoid load off of the ignition key switch.

19.09.2023

A**R

Fuse only

Would love to have had just the fuse that came with the item.

13.03.2026

B**Y

1994 Ford Ranger

This was to be a horn harness but it didn't work.

22.01.2025

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