popping glass fuses

[lt704]

Hi Folks. Last night i poped my brake light/tail lights fuse. I put in another one and it poped (broke). I still have directionals and hazards. One other thing i noticed after this happened when i had my hazards on my lisence plate light flashed as well, not sure if this is related or not. What and how should i progress?. Tomoorow i will start looking at the wires. I replaced the turn signal switch and headlight switch last year. My truck is a 68 C-10. Thanks for the help....Russ