On my B36(2002) an Aquasignal tricolour light was fitted which also had an anchor light as part of the system, with the anchor light fitted, if I remember correctly, immediately below the tricolour navigation light. Each lantern had its own light bulb and the combined fitting was supplied by a single three core cable. Two of the cores carried positive current, while the remaining core was the common earth. Because of Bavaria’s use of ordinary copper wired cabling and the consequent corrosion, I did have to replace the original and renewed it using tinned copper.