Download the service manual. There are wiring diagrams at the back. The E33 drawing is flawed by a missing section (scanning error) but if you compare it with the E19 drawing, you should be able to figure things out. There are only three relays, the interlock/turn signal relay, the fuel pump relay, and the fan relay. Your wiring has been cobbled and it will take some investigation to figure it out. As a guess, the extra relay was installed as part of changing the low beam to HID. I suggest that you get rid of it and change things back to the original configuration. This will take some effort to do well. You should be able to figure out what fuse is what by noting their wire colors and comparing them with the wiring diagram.