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the fuse was gonna be my suggestion. check to see if it blew again. Are you hooking to the 4 or 7 pin. I had a similar issue and I know for the 4 pin they make a $4 tester light that plugs in and the stuff lights up (or blinks for the blinker). If everything shows fine on the tester then it means the signal is good all the way to the plug. which leaves it a trailer issue. If the fuses are good and the tester still shows it not working then it has to be in the harness somewhere.
x2.....On what David has mentioned......and I'll add the below Trailer Wiring Diagram,


 
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