.. It is usually not the fuse itself, but the connection at the holder end .. a trick whenever one suspects power feed to any system is to give the fuses a few twist in their holder..
. better yet, use the glass SS replacements.. they do not seem to suffer this problem.
I hear both pro/con of each, but I personally have never had good luck with the open fuse concept..
I could not count the cars I fixed with a simple twist of a fuse...