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!

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Description

🔊 Amplify your ride’s roar with effortless power and precision!

VERSATILE CONTROL HUB - Perfect for horns, alarms, door locks, and more—upgrade your ride’s electronics effortlessly.
PLUG PLAY SIMPLICITY - Color-coded 4-pin relay sockets make installation a breeze—no guesswork needed.
POWER UP YOUR HORN GAME - Supports up to 80 amps for ultra-loud, high-current horn upgrades.
PURE COPPER RELIABILITY - Premium copper coil and contacts ensure 10,000+ cycles of flawless performance.
BUILT TO BRAVE THE ELEMENTS - Rugged composite housing shields against heat and harsh under-hood conditions.

The FARBIN Air Horn Relay Wiring Harness Kit is a 12V, 80 amp relay system designed for easy installation and reliable high-current applications. Featuring pure copper contacts and a durable composite housing, it supports loud horn upgrades and versatile automotive electronics control, ensuring long-lasting performance in harsh conditions.

Specifications

Connector Type	Wired
Contact Material	copper,pure copper contact
Contact Type	Normally Open
Current Rating	80 Amps
Mounting Type	Socket Mount
Brand	FARBIN
Operation Mode	Automatic
Wattage	960 Watts
Coil Voltage	12 Volts
Contact Current Rating	80 Amps
Maximum Switching Current	80 Amps
Minimum Switching Voltage	12 Volts
UPC	791313532516
Manufacturer	Ruian City Allrey E-Commerce Ltd.
Country of Origin	USA
Colour	Relay 4 pin single horn wiring harness
Number of Memory Sticks	1
Item Weight	99.8 g
Product Dimensions	14 x 8.99 x 3 cm; 99.79 g
Item part number	FB-JDQ
Item Height	1.18 Inches
Item Width	3.54 Inches
Voltage	12 Volts
Are batteries included?	No

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