1968 dart no brakelight left side but have on right..

Got my schematics out for the 1157 bulb sockets in rear. Dark green feeds left stop, brown feeds right stop. Traced all the way up to turn signal switch. Original headlight switch, aftermarket turn signal switch.Power to brown but not to green wire. Everything else works great..turn signal, markers, tails, etc. Anyone know what feeds the brown and dark green? Any help appreciated! Tom