Dash Lights Stop Working

[Nelly]

I was driving home and my dash lights and running lights just stop working and i went to wal mart and bought some fuse's and replaced every bad fuse i found and the dash lights worked for about another 2 mins and then the went off turned around went back to wal mart and bought all new light for the dash lights and more fuse's and got home use a test light and all the conection where getting power and even the wires behind the dash there where 2 wires that where getting power i have no idea what else to try can someone help me please i drive at night alot i work nights on a drillin rig and pull a trailer all my trailer lights work still...