tail liughts and running lights dont work
 

I have a 1999 xlt ford ranger 3.0 flexi fuel the other day i got opulled over couse my tail lights where not working i have checked the fuses all are good .for right now i have riun a hot wire from the battery threw my trailer plug to get them to work for now does any one have a clue to what is wrong and how I fix it ?