timek1m

so here is the story,
one day i installed a pioneer deck in, had no problem everything was fine, next week installed speakers into door panels, and blue and brown wire is + and - , but i might have accidently touched other black red green combo by accident and after that, the fuse blew, and head unit stopped since.

and ideas whats wrong and whats the fastest and easiest way of figuring this out? thanks.