Hi all I am fairly new here, I just tried installing an aftermarket amp to my 2000 cadillac Deville. after disconnecting the battery and reconnecting the battery I have no power in my car and no dash. Puzzled by this I tried cranking my key and nothing. So I have no way to check for codes as I have no power to my dash, I do however have power to my door lights, but not the dome lights, I also bumped the horn and now it wont stomp blowing. I am very confused and am running out of ideas. Im pretty sure that the battery cables are tight and on correctly, anyone have any ideas?

 

Anyone have a clue?

 

There is a ground wire at the right front of the engine compartment that attaches to the body then to the engine block.