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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FARBIN Air Horn Relay Wiring Harness 12V 80 AMP for Car Truck Motorcycle

FARBIN Air Horn Relay Wiring Harness 12V 80 AMP for Car Truck Motorcycle

Product ID: 214256006

Details

Connector Type
Wired
Contact Material
Copper
Contact Type
Normally Open
Current Rating
80 A
Mounting Type
Socket Mount

⚡80A high current capacity

🔌1.5m easy-connect wiring harness

🛡️Durable composite housing

¥3346

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚨 Amplify your ride with power and precision!

PLUG PLAY SIMPLICITY - Color-coded wiring harness makes installation a breeze—no guesswork needed.
POWER THROUGH ANYTHING - Handles up to 80 amps for the most demanding air horn setups.
PURE COPPER PERFORMANCE - Copper coil and contacts ensure reliable, long-lasting electrical flow with 10,000+ cycles.
UNIVERSAL COMPATIBILITY - Works seamlessly with all 12V vehicles—car, truck, or motorcycle.
BUILT TO BRAVE THE ELEMENTS - Composite housing shields against heat and harsh under-hood conditions.

The FARBIN Air Horn Relay Wiring Harness is a robust 12V, 80A relay system featuring a pure copper coil and contacts for superior conductivity and durability. Designed with a 1.5-meter color-coded wiring harness, it ensures easy installation and universal compatibility across cars, trucks, and motorcycles. Its high-quality composite housing protects against extreme temperatures and harsh conditions, guaranteeing reliable performance for over 10,000 mechanical cycles.

Specifications

ASIN	B07TN68VZB
Best Sellers Rank	#17,566 in Automotive ( See Top 100 in Automotive ) #35 in Automotive Replacement Electrical Wiring Harnesses
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 4.5 out of 5 stars (221)
Item Highlight	Pure copper coil relay, 4-pin, 12v, 80A, 1.5-meter wire harness, for all kind of single horn or horns with 1 pump compressor
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
Number of Items	1
Number of Packs	1
Operation Mode	Manual
Part Number	FB-JDQ
UPC	791313532516
Unit Count	1 Count
Wattage	960 watts

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