another 78 cb750k owner here, and a new guy as well. i had the same problem with my blinkers, replaced that relay (went to a auto parts store and bought one for $2) and they started working again. Maybe you already know this, but the relay for those are located next to the battery. Easiest way to get it out is to pull off the side cover, reach in and pull it off of the post it hangs on (its encased in a rubber sleeve that hangs on a metal post) then replace it. Its hard to find, easiest when you pull the side cover off then shine a flashlight in that nest of wires to your upper right. You have to kinda dig it out. There was 3 wires, black, red and green. The relay i got only had two posts on it, so i left green unplugged, it works great. If you already knew all that, well then ill shut up now. good luck.