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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.
 

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Get new terminals, clean the battery posts, and make sure the connections are tight. It's just a loose connection. There's more than just the nut/bolt that tightens the terminal onto the post, as well. There's the connection that attaches the terminal to the rest of the cable, as well as another connection on the positive cable with a smaller bolt that i can't remember right now.
 
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