Towing Issues: No Electrical Power, trailblazer ext, electrical power

Question
I have a 2003 Trailblazer EXT. My trailer electrical was working when I towed my boat to the lake. When I returned home it was not. I replaced a burnt fuse and it still is not working. I checked the ground wire and it appears ok... Any ideas? Thanks!

Answer
maybe there is more than one fuse in the system.

have you tried it with the trailer disconnected?  there may be a continuous short in the trailer, maybe from a wire or light filled with water?  Did the fuse blow again immediately?

try tracing the wire back to see where it does get power.

Just a few ideas.