Originally Posted by MazdaDS
could you just pozzibly need to up the fuse grade?
The fuse shouldn't blow if everything is wired correctly.
But do not put a higher amp fuse where it does not belong!
My aftermarket deck has a 3 amp fuse behind the unit ,
And installing it TO my original radio wire which is 15 amp,
If something were to short out ,the Lower 3 amp fuse would blow first.
It IS also possible that there is a short in one of your speaker lines .
But... If everything is wired right,AND there is not a short from a faulty wire in the Harness or speaker
line, It must be the new deck!
I would bet that you have a short in one of the speaker lines!
Connect without speaker harness,and see if it blows