How do I wire this switch?

After sitting all night, ths morning I tried the horn and I had to hold the button down for 7 seconds before it made a noise. After that on the way home there was the nornmal 2 second delay. It took about 7 seconds yesterday when the air leaked out and I had to refill the tank.
 
The selenoid doesnt even work today. I held the button down for 20 seconds and it just barely made a squeel. Where can I buy a better selenoid for my horns?
 
An air brake shop here in Greensboro said they have a solenoid that will work for me but its $50, which is more than the horns cost. Do you think its worth it or might I be able to find a cheaper one?



EDIT- The store I bought my horns from sent me an email back saying they are going to send me a replacement solenoid so I am going to hang out until I get to try it.
 
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