I have a question about installing air horns. The horns came without a wiring harness but I have made wiring harnesses for other things using relays. The problem I'm having is I hook one horn up and I'm using the horn fuse in the fuse box for my trigger on the relay and the one horn Will work fine. When I hook the second horn in to the circuit as soon as I try to blow the horns I get one blast on the horns and I blow the 15 amp fuse in the fuse box. Initially I wired the horns up with one relay for both horns I now have one relay for each and each horns compressor pulls 15 to 20 amps does anyone have any idea what I have to do to keep from blowing my fuse on my trigger wire.

 

no idea what vehicle your installing it on so I can't give specific instructions. You don't need to run your wiring into the underhood fuse box...especially if you can't find a large enough fuse.

I installed a heated washer fluid heater that draws near 60 amps. I bought a 60 amp fuse and an enclosed fuse holder. I wired it up directly off the battery. I used large wires. You can do the same. wire it off the battery. put the fuse within 6 inches from the positive battery post. search the internet for the correct wire gauge for the amp draw and length of wire. connect it up to the relay. the control circuit for the relay can be small wiring...only the power side of the relay will see the 40 amps.

there is a great video of some guy who wired a locomotive horn into his car...then proceeds to scare the **** out of people.

 

what i would do is tap into the old horn power wire in the grille and use that as the switch wire on the relay then like tech mentioned run separate power wire to the battery with fuse protection then to the compressor. did the air horn come with any wiring instructions? if not then search the interweb for wire size recommendations and dont go below that. in my mind you want to use at least 10 gauge wire for 60 amps as long as its not too long

 

I'm installing the horns in a 2010 Chevy Silverado and I have the relays power directly from the battery. I'm using the horn fuse with a fuse tap in the fuse box under the hood simply as my switch source or trigger wire and when I try to use both horns I'm blowing the fuse on the trigger wire. The relays I have right now are 30 amp I'm going to put 40 amp relays in and see if that makes a difference

 

As a professional driver, I almost never use the air-horn, It can make people distracted and possibly cause an accident, They work good on getting deer off the road however!

 

are you sure you have the relay wired correctly. the control side of the relay shouldn't blow a 20amp fuse

 

Ends up that I didn't have the relay wired correctly. I bought a harness for the relay and could not determine what pins were on what wires by looking at the diagram on the relay. I rewired them relay the proper way and now both sets or working without blowing any fuses

 

My neighbor has a kleinn train horn on his service truck and it is super loud.

 

Or scare them ONTO the road! 🤔😳😜