battery drain help!

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Just recently bought a 91 turbo. The car came with a bad battery, so I purchased a new one. Within two days of not driving it I came out to the car being completely dead. No lights no click on start up, nothing. I noticed that the previous owner had an audio set up where it was wired for two amps. My speaker does not work due to the speaker wires being wired for an amp. So would all those loose wiring be an issue? I just electric tape the end of everything and will charge my battery again