12V Train Horn for Truck with Air Compressor & 4 Metal Trumpet

I should give this a 4 star rating, as it says it is 150 DB. Well not according to my sound meter. It is 130 DB So still quite fun. Now I had no intention of using this on a vehicle. Oh no, I built the "sound blaster 2024" Used an old 14.4 volt cordless drill I had sitting around. The air pump measured just a little bigger in diameter than the guts that I removed. Just a few minutes with a drum sander and perfect fit. Used the trigger and speed control and of course the batteries. Works great!!! VERY loud. Literally only took me 1/2 hour to build this up. No, I didn't come up with the original idea, but this is my spin on it.

Made my own impact gun trainhorn. This horn is perfect. Its so loud it scared the crap out of me and i was expecting it! This would be perfect for a boat or car installation.

Train horn is loud, exactly what I wanted without the hassle of an air tank and running wire and high pressure air hose. Its good, definitely loud and noticeable. However, no where near as loud as a real train but way louder than a stock car horn. Very satisfied!

First and foremost, this does not put out enough sound. The tone is great, but nowhere near loud enough. I figured it was lack of voltage so I went ahead and set up an eight gauge wire with a 40 amp fuse tag to a relay and it did not change one bit I had purchased two, one for each vehicle and ended up using both on the same car to try to get some sound. The vehicle of reference is a 2024 Ford F250 and yes, the factory horn is louder than this train horn. Installation was quick and easy.

It makes noise. Not a particularly pretty noise, but it does make noise. The tone sucks honestly. One horn is a vastly higher pitch. The tone is generally flat but that smallest one is super sharp causing what would be a glass shattering high pitch sound if this thing were even half as loud as it claims. I did have to upgrade to a 60 amp momentary switch over the one Amazon suggested. That helped. The 15 amp one Amazon recommended prevented it from being any louder than my radiator fan. I’m sure if I had a larger amperage button it would make it louder than the factory ford horn, but at this point I’m just going to buy a real one. The whole reason I bought it was for it to be louder than my factory horn which, by the way, isn’t very loud. Definitely not loud enough for other drivers to hear. So the takeaway is, 12 gauge wire, above 60 amp horn button, and it should be loud enough for others to hear.

Awesome

You'll need a rasp on a drill to waller out the plastic so the airpump will fit. That takes to most time, @20min. I glued the motor in which was a tight fit once the halves where screwed. I used good old 3m weatherstrip adhesive. Flatten the L bracket and drill two holes in back of drill. Finagle the two bolts in while the glue is setting up. I left the bolts long so you can grip, while tighning the nut. Then I covered the bolts with tube and 3m. This thing is loud. The 4tones make the awesome sound better than two. No wires come in kit. Bolts,horns,plate thats it.

sound is great, louder when mounted outside the truck. sound is a little muffled if mounted under hood. They could improve on the electrical schematic.