i am having trouble with my car. every time i hit the brakes my parking lights turn on and every time i turn on the parking lights the brake lights come on not counting the third brake light. i checked all my bulbs and the wires all the way accross the back of the tail lights they arent smashed or anything. when i take out the parking light fuse the brake lights still activate the parking lights and the parking lights activate the brake lights but when i take out the brake light fuse it does not activate the parking lights with the brake or the brake lights with the switch.i was wondering if it could be just a bad ground of one of the systems causing the electricity to bleed back through the other system. also where would the ground be located for both lighting systems.

One of your brake light bulbs has shorted out, and is allowing current to flow through both circuits.