One problem related to horn assembly has been reported for the 2006 Ford F-350. The most recently reported issues are listed below.
At 200am today my horn on my 2006 f 350 started blowing. By the time I realized what was going on the wires had started to smoke under the hood. I had to disconnect both batteries in order for the horn to stop. This is the first time this is has happened to this truck. No other problems to report at this time. I will be having it towed to a dealer today.