2002 Kia Spectra

Electrical problem
2002 Kia Spectra 4 cyl Two Wheel Drive Automatic 133000 miles

I purchased a battery in April 2009 and recently the car died---when AAA was giving me a jump we determined that the battery was corroded. I had a new battery installed and it seemed like all was fine, however, my vehicle is making a squealing noise and today the radio was going in an out and the lights were dim. Once I turned the headlights off; the radio came back on, but it was still going in and out. I plan to take it to a mechanic, but would like to have an idea on what the problem could be.
December 1, 2009.

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