I'll try not to sound like a real dumba$$ with this but I'll try to
guide you.
My friend had the same truck with the same problem.
There is some little switch under the dash that needs to be in the
right position when you insert the key. If it doesn't work one way
try it the other. Or temporarily disconnect the horn or pull the
fuse ...
Well, good luck to you.... I would call my friend but it's 12:00 midnight...