Review on CARMOCAR Eletric Car Horn Kit 12V 135Db Super Loud High Tone And Low Tone Metal Twin Horn Kit With Bracket For Cars Trucks SUVs RVs Vans Motorcycles Off Road Boats (Neo Chrome) by Wendell Chapman

I used these to replace the stock horns. While not designed for trucks, it's a little louder than the original, but spend the time and money installing truck horns. These horns do not require a special +- terminal assignment! With this type of horn you do not need a separate suspension when replacing the standard horn(s)! Simply ground one of each horn and the other horn pin connects to the vehicle's serial wiring. A separate harness should really only be used when attaching antlers.