Tail Light Trouble(plus pics of truck!)

[highliner]

So I bought a new wiring harness from Painless. Love it but one problem I can't solve ( which kills me because I build powerlines for a living). My brake lights work, turn signals work, But with my brakes on and I turn on the left turn signal, the right brake light turns off. Works okay with the right turn signal, just the not the left. IT'S DRIVING ME CRAZY. I keep thinking it's something in the turn signal switch killing power to the brake light. I don't know. Hopefully someone has endured this horror and can shed some light. Now for your viewing pleasure... Plus I just installed the LMC 3 point seat belts and they are very slick. Pics of those later. And I painted the truck myself. First time painting anything.