thetiger wrote:If I understand correctly, you grounded a live wire (power amp). This wire will supply the 12V to the amp once you turn the key on and if you are not using such feature you are suppussed to leave it alone and not grounded. I think you might have smoked the unit but check to see if it has some sort of protection (fuse) that might have burn instead and replace it while leaving the wire cap and tapped. \
That's my two cents, hope it works.