I am in the process of doing a '78 550 cafe. I mounted the factory electronics in-between the frame rails above their factory location. The side where the factory regulator mounts is toward the back and the starter solenoid faces up. The only "rewiring" that will be needed is replacing the original positive battery cable with a longer one, and grounding the battery to the frame under the seat. I will try to post a picture tomorrow. Unfortunately, I am no where near done, so I cannot say what issues may arise from the way I am doing it. Also, I need to relocate the regulator and figure out how I will mount the battery still. The battery will be waiting for the seat.
