Turn signals not working

The turn signals on my expedition have a intermittent problem. On either side they will work but only at times and for a few seconds. If you play with the switch it sometimes helps. I have replaced the relay and multi function switch and still have the same problem. I also found a blown fuse on the right hand trailer plug. Any ideas as to what to check next?

When I asked the question I said relay. I meant to say that I replace the flasher behind the dash on the left (drivers side of vehicle) side.