My two cents worth on fixing your wiper relay. My intermittent wiper setting was stuck, and the wipers were running all the time, even when I turned them off. I followed the posts on this thread, and also this one ( 83 FJ60 Windshield wiper noise - https://forum.ih8mud.com/threads/83-fj60-windshield-wiper-noise.1027654/ ) to fix my issue by cleaning the contacts and lubricating the gears. On lubricating the gears, I would recommend using a plastic compatible grease/oil so that the plastic does not deteriorate over time. Hope this helps.
btw - I have an 84 FJ60.
btw - I have an 84 FJ60.