I have a 2000 F150 5.4, I have a electrical problem, no brake lights, turn signals,or 4ways. Checked the fuses all good. Any suggestions what to check next. Thanks for any help.

 

I've had heavy corrosion in my trailer light connector cause issues like this before. Just an idea.

 

you could probe the wires with a multi-meter or test light to see if there is any electrical connection there, cant imagine there is if all of them are not working, only thing i can think is to probe the connections and work your way up the harness until you find where power stops coming through

 

And while you are at it check your grounds.