Turn signal and radio problems with 01 truck

Hi, I pulled a trailer with my truck yesterday and I think something may have happend since I used the trailer electrical plug.

Ever since yesterday my radio volume goes to quiet on its own, I can turn it back up but it does it again a little while later. Also My right turn signal works ok with the key on and truck not running. If I start the truck the right turn signal only works if I turn the lights on. The left signal and hazards work just fine all the time. I checked fuses and nothing blown. I have not tried the flaser yet. Any help would be appreciated. Thanks Curt