I just purchased a 99 F350 with a 7.3 in it. The radio was already out of it but I didnt realize why. Now I know it prolly has something to do with the leaky window problem I read about all the time on here. Im having an issue with my radio staying on plus my fan blower. Once I open my door I can hear a buzzing noise under my radio. Also sometimes my high beams work and sometimes they dont. Plus the light doesnt go off when I shut my door but a buzzing noise came from my fuse box so I pulled the small black relay out to shut the light off. oh yea the other day my horn just went of by it self so I had to pull the fuse on it so I didnt have to hear my horns blowing while I was going down the road. So I guess my question is could all this stem from the leaky window syndrome or could all these be none related and just be a pile of seperate problems?

 

Sounds like LWS to me.

Water is getting into the fuse box and GEM module under the left side of the dash and is causing mischief. Dry it out, get the windshield sealed, and cross your fingers that there's no permanent damage from corrosion.

 

Where is the GEM located? I believe its behind the fuse panel but I wanna make sure. Also I have looked behind the fuse panel and its pretty much dusty back there. What would I be looking for if water has damaged it?