It sounds like you got a short in the rear half of the wiring harness. I can't be positive, but I think the brown wire comes from the head light switch, and seeing that the lights don't work when you turn on your head lights, check for a bare wire or broken wire that may be touching metal somewhere. I think tan may be the color for the turnsignal wires, but don't quote me on that.
Also, check you grounds and connections and make sure they are tight and clean.
good luck and hope this helps.
69 Camaro, 496, 10.34 @ 134.77 mph.