2007 Mitsubishi Triton Driving On Highway Last Night Way Home Had Lights On

I was driving on the highway last night on the way home and had my lights on, when all of a sudden the instrument dash lights cut off n drivers side tail light aswell and all trailer lights aswell ?
Was a bit weird that all other lights worked on the car. Even on the drivers side that lost the tail light, the indicator worked, reverse light worked and brake light aswell just not tail light.
Checked fuses under dash and they looked ok.
also when got home swapped the drivers side and passenger side tail light bulbs over and it worked fine in passenger side, so i knew the bulb wasn't blown but the drivers side still did not work.

any ideas ?

Thanks