You might want to get an electrical evaluation done on the car, the wire could have gotten wet at some point, condensation could cause it to blow out wire could be old and thinning or your load could be to much for the fuse. why is the question? have you added and electrical upgrades to the car?
you have a short in that system somewhere, gonna have to trace it best you can
Search Chevrolet Blazer Questions
Chevrolet Blazer Experts
Related Models For Sale
Used Cars For Sale