just change the fuse with the SAME rating thats one it. don't go any higher or lower. where did you get the harness from? all the wires on the radios harness side should match the colors on the harness you bought. don't connect the orange or orange/white. when you connect these wires use wire connectors and make sure all your connections leave NO wires bare. the insulation should be convering the metal. you probably connected the wrong wires or had two wires touch and short the circuit causing the fuse to pop.