My sister blew the main fuse in my 2001 mazda millenia via reverse polarity, I am having a very hard time finding the correct fuse to replace it with. I know it is a 120A fuse. Unfortunately I do not have my owners manual anymore and I purchased a 120A fuse from AUTO zone and the fuse does not fit and they don't seem to know what they are doing. PLEASE HELP! Also if there is anyway to get a detailed description on how to replace it once I have the right fuse that would be wonderful. I thank every one of you for your time and help. Have a great day!

God Bless