I have a 97 GMC 1500 with factory radio / CD player. Today my battery died. Prior to this for some time now I head a noise which resembles a fan or blower running under the dash panel. So after fooling with thew alternator today, I started to lok for the noise. It was pulling current and made quite a large spash when the battery terminal was connected. I pulled all fuses and relays until it stopped, and its on the one radio circuuit. I have two fuses marked: RADIO RADIO BATTERY
When I pull the RADIO BAT fuse, the noise stops, and also kills radio and clock and CD player........SO what is in there that can be running? I do not recall it doing this when I first got this truck? Is there a cooling fan for the radio and clock? I would not think so , but one can never tell with todays vehicles. ANy info or help is greatly appreciated as to what I need to look for on this circuit that is pulling down the battery and making the noise.
Regards
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