thallac

Hi read with your interest your post. I would like to upgrade my stereo. I bought an lepai amp, cut the adaptor and connected the wire to the yellow and black wire feeding the car stereo currently installed . I switched power on and blew the amp (had a 5 amp fuse and 12.4 volts coming through batteries). Can anyone please provide any advice on what t-amp to buy how to convert the power to run on 12v and how to wire on a boat. I do not have much experience of electrics so open to a recommendations of an electrical engineer.