Wiring nightmare here..

Ok.. Whenever i switch my parking lights on my 20amp fuse blows and i have no tail lights, side marker lights or parking lights.. My headlights turn on but the motors are disabled so they stay down. I have tore my car apart looking for the short and i cannot find it anywhere.. Has anyone had the same problem?? I bought a new switch to no avail. Any help on where i can locate the problem would be great. I took all of the bulbs in the lights that were disabled also. Thanks!

 

You can try taking the fuse out, take all the bulbs out or pull the connectors, and put the light switch to off.
Use an electrical meter to measure from each bulb position, the resistance between the supply and the car body. It should read open circuit on all.

If you get any reading other than open, you may have found the wire with the short. Or you may still have a bulb in place, and that will show a few ohms resistance you need all the bulbs disconnected.

If no fault shows turn on the light switch and try again.

If the short appears with the light switch on, you know it is between the fuse box and the switch.