I have a 2007 Roadster with 12,600 miles and a couple of months ago, it would not start. Key would turn but I didn't hear anything when it is turned to start (click). However had all electrical lights on dash panel, headlights but key fob did not work. Once I charged the battery -- the car started.

Well problem has happened again, yesterday, have lights on dash, headlights, dome light, but no horn. I tried charging the battery again (Interstate battery purchased last year) but that didn't seem to work. Any ideas before I have it towed to the dealer. Thanks in advance for any help.