You already said you had good voltage at the brake bulb, with the brake pedal depressed. If they are dim, I'm still thinking ground.
Do you want to check voltage to and from brake switch? Orange wire to brake switch is hot all the time. When you activate the brake switch by stepping on the brake pedal, the white wire goes hot, carries voltage to turn switch and then to brake lites.
I can't tell from here if your brake switch is adjustable?
Tuesday, March 18th, 2014 AT 1:35 PM