Ok so my 2004 GTO has some type of electrical issue where it completely shuts off everything. No type of power whatsoever. I will play with the positive end terminal and cable and it will come back on, but when i go to crank the car it makes a pop like you would hear if you snatch out an auxiliry cord from a phone and goes dead again. I have gotten the battery tested, and got a diasnostic and there wasnt any codes being hrown. Any ideas? Maybe a bad battery cable? Negative terminal doesnt have anytype of corrosion or anthing on it.