It shouldn't be too bad. I did this once before on my VW bus, and in that case, I had to hook up a new horn button, too. Actually, I installed the button in the parking lot of Subway in Ishpiming, Michigan. (Wow, I love Google Maps. So to actually do this in my (unheated) shop is actually a bit of a novelty. :)
Oh, and I found the horn at Harbor Freight. Here's a list of similar items they carry. I think it would be fun to install these on your Volvo. The metal horns sound better than the plastic ones.
Well, by the time I'm done, I'll have constructed a walk-through for this job. The wiring will be similar on a Corolla. I'm going to hook the relay up to the switch at the old horn site, and I'll run a line from the battery though a 30amp fuse to another point on the relay. Then I'll run another wire from the relay to the compressor. Then one last wire from the compressor to ground. And that's pretty much it for wiring. Mounting all that hardware varies from model to model, of course.
When I saw you were replacing your horn, the first thing that came to mind were the air horns at Harbor Freight. ...and then I scrolled down and saw that's exactly what you got. What a riot.
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Oh, and I found the horn at Harbor Freight. Here's a list of similar items they carry. I think it would be fun to install these on your Volvo. The metal horns sound better than the plastic ones.
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