Originally Posted by Iggy
Check the ground connections below the horns on the vertical post.
In the past this ground connection has become bad and needs to be cleaned and reattached.
Here are a few pics that others have posted.
The only other things I can think of is to test the horns by taking a positive 12 vdc to the horn terminal pin and test
I removed and cleaned the ground connection(shown in the picture). Horn still did not work.
I then removed the horns and tested them with a 12 Volt battery and both horns worked. Reinstalled the horns and they do not work.
Stumped on what to do next other than take the RV to the Ford dealer($130) just to do the diagnostic.