No turn lights or brake light

Ok, the inst. fuse is the only one I don't have any power to. Ok, got my mind working here... The inst. fuse will not have power unless I pull the head light switch out to at least the first notch, correct. I haven't tried that. I have power to all the other fuses with the key on. Now to make sure, the brake light switch is a ground, correct, or am I wrong on that.