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I have one of the horns on my '04 HL 7-pass that sounds like a dying cow! I am trying to disconnect each one and see if it is the low tone or high tone that is bad.

I have not decided if I want to get a Hello 135 db. after market horn or just go to a junk yard and pull a horn off a Tundra, etc. all 12 volt Horns are the same right?? All the aftermarket ones say universal fit for ANY 12 volt system vehicle. Guessing only Toyota has the same plug for the horns CORRECT?

The horns sure are hard to get too on these SUV's!!

 

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Well after using the horn more seems like the low tone is bad high tone still seems clear soounding. Which is the low tone in my '04? The one behind the grill or the one in front of the drivers fender?