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Any body know a free, reliable, box dimensions program?

My mom has a 2002 tahoe and shes claiming that the battery light has come on three times in the past two days. She then proceded to take it to a Shell station and they told her it is her alternator or a part in the alternator. I dont know much about alternators but I plan on getting some futher input from a freind who owns a mechanic shop but regardless does anyone have a brand name or model they recomend lookking into?