I got lucky when I ordered mine. They mostly shipped for $12.99. When I saw the price was so low, I went ahead and jumped at it. Planned to order more but they changed the price to the original price. Anyway, I installed this in my 2012 VW GLI as I have air suspension on the car which means I have an air compressor with two 480c compressors going to a 5 gallon aluminum tank. Both wires coming out of the seleniod were both red, so it doesn't matter which is ground and which is positive. It still works in any combination. It took a while to find a place to install them as the horns are quite long and I don't have much room in my car. Finally after a long search. I found a perfect spot for the horn. Run a 1/4 DOT wire from the solenoid to the back of my air tank and also ran a positive electrical wire from the solenoid in my car to the switch. And the wire coming from my battery is also connected to the switch. I also installed a 3 amp fuse as I just want to be safe. At least those horns are so loud! You are not joking. It also sounds like a truck horn. Not bad for the price. I love this horn.
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