2004 Mazda MPV "04 endeavor headlight working" Questions

...04 mitsubishi endeavor went out. the horn on my 04 mitsubishi endeavor went out and also noticed at the same time the alarm on my lock n unlock remote doesn't work. How do i fix the problem? Standing ...

04 endeavor The reverse polarity will have "zapped the radio" There is a possibility that only the supply fuse has "blown", but depending on the radio make, could have blown the internal fuse as well.