Help yesterday everything was fine I left it hooked up to my horse trailer because I planned to use it today..I have no turn signals or brake lights...and it happened overnight....does anyone know what the problem could be...fuses are all good and so are the bulbs..

 

does anyone know what would cause my turn signals and brake lights to stop working? Fuses and bulbs are good? 1997 F250 powerstroke

 

I've moved your thread to the correct forum for your truck.

 

Can you elaborate. The lights on the truck don't work? Or the lights on the trailer don't work? Or both?
Do you know that they were in fact working the day before and if so was it at the beginning or end of your trip?

Ok. So if it's both not working and all fuses, relays and bulbs are good then I would look into the multi-function switch. They have a tendency to fail. This is the stalk on the left side of the steering column that control blinkers high/low beam and wipers.