Blinker switch

I have a 2005 Chrysler PT Cruiser convertible.(25,000 miles). I have had to have the blinker switch replaced three times. Recently the headlights went out. The technician said that when the bright lights were put on it blew out the headlights. What do you think could be causing the blinker lights to keep going out? :( About three months ago I had a trailer hitch put on and wired. I took it back to the U-Haul people to have them check their wiring. They claim their wiring is fine and is not causing the problem. The Chrysler dealer keeps replacing the blown part but not fixing the underlying problem. If you have any ideas what might be causing this problem please let me know. Thank-you. S. Griffin