hey everyone, yesterday i was in a hurry and left my parking lights on all day and killed my battery, no big deal just got a jump and everything was alright. Then when i started driving off i noticed a whining noise that was goes up and down with the revs of the engine and is only there when the radio is on. It goes away when i turn the radio off so i figured it might go away after the battery is fully charged but it has not, does anyone know what is going on? im thinking there is some sort of feedback through the speakers coming from the alternator

thanks alot

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2002 Tremor 2wd 3.0 4.10 L/S
6000k HID High/Low beams
255/70R16 General Grabbers AT2
Explorer OHC