Will hella 002768821 24v horns to a dc36v/48v battery using a dc24v20a 480w step down transformer be the correct amps and watts for these horns?

Transformers only work with AC not DC. You could use a voltage regulator or a series resistor to reduce the applied voltage to 24V. Or, with 48 volts DC you could just wire them in series so that they each get only 24 volts. The current (amps) will take care of itself (I=V/R), about 5 Amps, I'm told.

Will this fit a 2016 subaru legacy? please only yes or no. no shoulds.

This isn't a yes/no question. It'll fit any car so long as you can find a proper place on the frame to mount them. Mine came with only one high-tone horn. I had to find a place to mount the second. Look at videos of others doing it. You may need to drill, and you'll need to run one wire only as the negative runs through the frame.

why are there two ? can i just install one?

Some vehicles are outfitted with two of these, like my SUV. Yes, you could install just one, but I find myself wondering why you don't just by a single horn?

Hella 3am 002 768 821 Signal Horn Hella Heavy Duty

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275.76 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔔 Make your presence impossible to ignore with HELLA’s heavy-duty signal horn!

TRUSTED GERMAN PRECISION - Backed by over 100 years of HELLA’s automotive expertise and strict ECE compliance.
ENGINEERED FOR 24 V SYSTEMS - Optimized for heavy-duty vehicles and commercial use with reliable 24V operation.
DUAL HIGH LOW TONE DESIGN - Creates a rich, penetrating acoustic signature that stands out on the road.
DURABLE BLACK GALVANIZED METAL BUILD - Rugged construction ensures long-lasting performance in all conditions.
COMMAND ATTENTION WITH 113 D B LOUDNESS - Cut through traffic noise with a powerful, unmistakable horn sound.

The HELLA 3AM 002 768-821 Signal Horn is a robust, vehicle-specific 24V horn set delivering a commanding 113dB sound through dual high and low tones. Built with black galvanized metal housing for durability, it meets strict ECE standards and is engineered with German precision for reliable performance in passenger and commercial vehicles.

Specifications

ASIN	B01EG18E1U
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	188,773 in Automotive ( See Top 100 in Automotive ) 317 in Car Horns
Brand	HELLA
Brand Name	HELLA
Colour	Black
Compatible with Vehicle Type	Passenger Car
Customer Reviews	4.4 out of 5 stars 118 Reviews
Fit Type	Vehicle Specific Fit
Fit type	Vehicle Specific Fit
Global Trade Identification Number	04082300558906
Included Components	Horn
Item Highlight	113dB(A) - Frequency Range: 335/435Hz - High Tone/Low Tone - Electric - ECE - Housing Colour: Black - Quantity: 2
Item Weight	0.49 Kilograms
Manufacturer	HELLA
Manufacturer Part Number	3AM 002 768-821
Manufacturer Warranty Description	Limited 1 Year
Material	metal Plastic Stainless Steel Alloy Steel
Material Type	metal Plastic Stainless Steel Alloy Steel
Model Number	002768821
Noise Level	113 Decibels
Number of Items	2
OEM Equivalent Part Number	A100-323-TERBERG-BENSCHOP
Part Interchange Info	002768821
Style	High & Low Tone / 24 V
Style Name	High & Low Tone / 24 V
Unit Count	2.0 count
Voltage	24 Volts

Reviews

L**R

Super

Funktioniert

10.08.2025

K**2

works great in series on a 48v circuit

this is a real 24v horn, can't really say much more than that. i ran the two in series on a 48v circuit and haven't had a problem. sounds like a honda from the 80s. or most motorcycle horns.

3.09.2020

H**.

Muy buenas, excelente opción a 24v

No es tan sencillo encontrar productos para 24v y funciona muy bien.

27.04.2022

H**S

Works as described

Good stuff.

9.06.2020

S**N

Laute Hupe, kein tiefer Ton

Klingt wie einen normale Hupe, ist aber wirklich laut, nach Hobbymessung (Handy) 118 Dezibel .

3.08.2026

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275.76 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

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