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The harness runs up thru the steering column and is riveted to the terminals on a plastic assembly. This is screwed to the steering column and the lever is screwed in to the assembly. It is possible the assembly is loose. More likely it is broken. You will have to remove the horn and steering wheel to find out. It is not a big thing to change if you do two simple things. Make sure you have a good diagram of the connector before you take it apart. Tie/tape a cord to the end of the old wires before you pull them out of the column. The new harness and switch will not come with the connector installed because the wires have to go down a channel inside the column. You have to but it on.
You should disconnect the battery first. A loud horn blowing tends to make most people uptight, and if you are like me, You can't find the correct wrench in a hurry-- and get more uptight... or is it up tighter??
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