German Potato Salad

2 potatoes, sliced
1/2 cup onions, chopped
1/2 cup celery, sliced
1/4 cup green peppers, diced
1/4 cup vinegar
1/4 cup oil
chopped parsley
sliced bacon, cooked and crumbled

Combine all ingredients except parsley and bacon. Add salt and pepper to taste. Stir and cook for 5 to 6 hours in crockpot. Add sugar if needed. Garnish with bacon and parsley.