short somewhere?
If the fuse STILL pops, you have a short in that fuse's circuit. Figure out what else that fuse powers and start unplugging things one by one to find the short.
If you don't want to keep wasting fuses and have an ohmmeter available, remove the fuse and check the resistance between the load side of the fuse and ground. If you find a dead short, start unplugging stuff one by one (as stated abopve) until you get an open on the meter. That'll tell you where the short is.



