My 2003 600 horn crapped out on me a couple of weeks ago. I was getting power through the wires and made sure I was getting good contact. Instead of buying a new horn I searched Ebay and found a 04 600 horn for $5. It looked the same as my horn in the picture, so I bought it and it works fine. The 04 horn is a tad bit smaller and lighter. It will bolt up the same way the 03 did. I think it's also louder/sharper. I thought this might be a useful post just in case this happens to any of you. Pics are attached and the 04 horn is on the left and installed.