2002 Dodge Dakota Tail Light fuse is blowing

I noticed one day that my instrument cluster where the speedometer is and the lights for the window switches were not lighting up, and also my tail light were not working ( I actually was pulled over by highway patrol for the tail lights) so I went to auto zone to buy some fuses. I replaced the fuses and the interiors worked again and the tail lights worked. So I started to drive again and the fuse popped again so I went to another auto zone and I replaced the parking lights relay and a new 20 amp fuse. The lights again worked until I starting to drive again and the fuse blew again. I got home and replaced the 20 amp fuse and the lights worked again. I am wondering what is causing this and if accelerating is playing a part in this? This is my work truck and I really don't have the cash to take it somewhere, I hope somebody is able to help me out. Either way I thank you for your time for even just taking a look at my question.

Thank you