Everytime that I hit the brakes, the headlights flash and the horn blows for about 30 seconds. I am guessing that it has something to do with the factory alarm? I do not have a key pad.
It is a 1997 F-150.

 

I'm guessing that everyone gets out of your way… and calls you dirty names.

I recently read a post on another site with similar issues. Might help. Might not. The guy had a 2000 F550 with horn that would blow on own, dome light would not go off, a bunch of other loopy electrical issues.

Turns out, his fuse box was all corroded from moisture.

 

yea, do you have damp carpet under drivers feet ? Windshield leaking when it rains ?

 

Don't have any dampness or corrosion. It just seems like when I hit the brakes, it triggers the alarm