BMW Repair: Electrical, side marker, turn signals

Question
I have a 89 325i the right side marker lights keep blowing its fuse.  It blows the fuse with all bulbs disconnected. I tried a jumper fuse from the left side marker lights still blows all brake and turn signals work I've owned the car since it was new never wrecked.  Is this a problem you've seen before or where should I look next.  I believe I ruled out the switch itself from what trouble shooting I've done I'm at a lost on what to do next. I'm afraid it may be a dead short somewhere, if it is is there an easy way to test for test?

Answer
You say the right side fuse?I show fuse 23 feeding all sidemarkers, the license lights and the right park lights.
 Try disconnecting the Grey/Red wire and the Grey?White wires at the light switch to narrow it down.
 Do you have the active control unit (bulb check readout)?