Place dried beans in large stockpot. Cover with 5 cups water. Cover pot and bring to a boil. Cook 2 minutes over high heat. Remove pot from heat and allow to stand, covered, for 1 hour. Return pot to stovetop and cook covered for 2 1/2 - 3 hours, or until beans are tender. Drain. Combine cooked beans, onion, 3 cups water, bacon, and taco seasoning in slow cooker. Mix well. Cook on low 8 - 10 hours. Add tomatoes. Stir well. Cook another 30 minutes.
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