1989 Other Mazda Models crazy tail/brake lights

hey, i have a b2600i and my tail lights and brake lights dont work, my right signal does work but my left signal activates my right brake light (and left signal in the front), and my reverse lights dont work instead my left signal stays on (without blinking) while in reverse.... is this a complete short out? or is there a way to fix it that would not be crazy expensive.
thanks