Step 1

Place the beans in a slow cooker with enough water to cover, and soak 6 to 8 hours, or overnight.

Step 2

Drain the beans, and return to the slow cooker. Cover with water, and mix in the carrots, potatoes, celery, onion, and ham.

Step 3

Cover slow cooker, and cook soup on High for 3 1/2 hours. Switch to Low, and continue cooking at least 6 1/2 hours. The longer it cooks the more flavorful it becomes.