prelude audio trouble

[xenoin]

I recently bought a 1989 prelude si. So I went out and got some tune-up necessities, as well as brakes, etc. I bought a pioneer head unit for my car and have spent already a couple of days just trying to get it working. My connections are all correct but i have no wires with power. This is because I tried the black, and it wrked, then I saw a spark and its no longer a hotline. then I tried my cigarette lighter wire, it wrked, I saw a spark but it wrked until I put my dash back together and now it doesnt. I checked my fuses, and all of them are fine. Why are my wires that have power one min, losing it the next??? No fuse shortages either. Can anyone tell me how to get power(electric current) back to the wires that went out? Or can someone plz explain how I can myself hook up a new wire with power to just turn on my raio?????? Any help is Greatly acknowledged and appreciated....thank you

[96CivicEX06]

My friend was installing a head/unit in a car and the similar thing happened, once he put the h/u back into the dash, it stopped working: reason being fuses were blown. Make sure you double check that you haven't blown a fuse by shorting wires. Did you solder or crimp the wires? Did you put heatshrink on the adjoining wires or electrical tape?