I don't know the exact fuse location but what you need is to find a power supply that is hot when the car is turned off and one that is hot when you turn the ignition on. All the rest of the accessories should be off- headlights,blower, signals, park lights, wipers... I'm telling you this in particular because of the headlight incident. You will also need a good ground and good wire paths for your speakers. Make sure your speaker wires are not grounded . Make a test light. All you need is an automotive 12v bulb and two wires. Hook it up to a power supply and connect it to your speaker wires one at a time. If the light comes on, your speaker wire is grounded. Disconnect your speaker wires from the speaker and the wire harness from the back of the radio before you test. You can also use the test light to find your power supplies too. Do you have a volt/ohm meter? If not, get one, they are cheap (20$ at walmart) and very usefull. A test light is cheap and usefull too, but they are easy to make. Good luck with this second attempt. PS, I admire your fortitude 
That's the way things get done!
That's the way things get done!
