nope i didnt disconnect the battery, which i should have..

Anyways, i called a mobile auto electrician to come out to have a look at the car, turns out that it was one of the fuses under the bonnet,, not sure which one... Cant believe i missed it. Payed the guy $150 to put a fuse in there.

ANywhhooos the headunit works well, but it get sooo hot at the back of the headunit, burns fingers...
Why could this be?

DOes the civic come with any factory amps or my headunit cant handle the power thats comming through?