Join Date: Oct 2014
Location: Lake Arrowhead, Ca.
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Reversing the polarity on a radio may not blow a fuse but it could take out a transistor or a pre driver or both.
Diodes are like a one way gate to protect these components but all bets are off when you reverse the polarity.
Did you smell anything or hear a pop out of the radio when you did this?
The board in it may have surface mounted components and I only know one tech that has the equipment to work on these boards.
Look in your manual and find the radio fuse and don't just look at it test it with a DMM and if you don't have one replace the fuse with a new one.
If this isn't it you may have to source another radio.