12+ years after your post, I just had this happen to me. I checked the flasher relay because of your post and it was filled with water. I was dangling straight down after I washed my 67 fj40 and water filled it up. I would not have figured this out without your post. Thank you.OH, Now I remember, I had this same problem. My turn signal flasher assy (the little round relay) was not grounded good in the bracket. Check that.