On a 2005 f250 diesel you remove the 3 phillips headed bolts that are under the sterring wheel, plus the cover under it. ( pull straight out and let it drop down to free the bottom. Look for a black wire with a pink line running thru it. I just cut mine. End of annoying chime. Some guys do a better job and take the wire off where it joins the key tumbler. My after market stereo make it 10 times louder for some reason. Takes 3 minutes to do this and well worth it.