Grounding Issue?

So, with the headlights on, you have no problem, but, with the headlights off, you do? Doesn't sound like a brake or turn signal switch problem. Sounds more like grounding or crosswiring there somewhere. The taillight/headlight circuits should be totally separated from the brake/turn signal circuits. Most of our Mopars have the brake light and turn signals using the same filament (the big one) in the 1157/1034 bulbs, both front and rear. The other filament in the bulb is for the park/taillights. A bad ground, wrong bulb, or corrosion in the socket can cause all sorts of strange results.