I am having an issue with my inline main fuse. I have had the same setup for probably 6 years in my truck and after I sold it I moved to my car. I purchased an lc2i and hooked up to my factory head unit. This has been working for over a year with a 10 in sub. I just purchased a 12 in sub and evertime I switch the speaker wite to the 12 it blows in 10 to 20 seconds. If I hooked the 10 back up and put a new fuse its fine. Any suggestions.