I have a 05 Ranger and I've been having alot of trouble lately with the electronics in my cab. It started off with my horn when I would go right my horn would go off and now that I unhooked it my CD player skips when I turn right. My dome light doesn't come on when I open my driver side door but It does for the passenger door. Even with all of that my main problem is that my speedometer and other gauge lights wont work and neither will the cigarette lighter sockets.I do have an aftermarket radio that's been in my truck for years but I don't know if it or the wiring could have something to do with it. What exactly would I need to do to fix the problems cause I'm not sure if I need to look fort shorts or fuses maybe both?

 

Multiple unrelated devices having problems usually means a problem with one or more grounds.