Likea fool, I didn't turn the headlights off last week while attending a movie. Although she started, the lights were very dim as I drove Home. Since the battery was old, I replaced it, but I have no electricals at all. I suspect I might have blown a main fuse, but the manual I have doesn't show the main fuse block. Anyone have a solution?

 

You dont say whay model/year it is but a blown main fuse will make every circuit dead so that cant be the case. Most mazdas have a fuse box under the hood and one under the left side dash.