2004 Ford Thunderbird Is it a faulty fuse or a short?

Driving my T-Bird to Maine, I noticed that the left/right blinkers did not work. Then noticed that lights did not turn on properly. With headlights on, when I tried to turn on left or right blinker it instead turned on high beams. I could not engage emergency flashers and when I parked car, fog lights or head lights would not turn off, even with switch in the off position.
Fuses seem OK, but I have had to disconnect battery to turn off lights and the reminder beep.
Car was running fine and had recently undergone major service.
Only major change was that I put the hard top on to make the drive. Could that in some way upset the electrical? If not any ideas?
Many Thanks