To make the salad, preheat a grill on high for 5 minutes. Reduce the heat to medium-high and grill the corn with the cover closed, turning occasionally, until some kernels are black, about 12 minutes. Remove and cool corn slightly.
Using a sharp knife, cut off the kernels into a very large, deep serving bowl. (Hold the narrow end of the cob, point the other end into the bowl, and cut downward, so that flying kernels are trapped by the bowl itself.) Add the beans, bell peppers, red onion, chili pepper, cilantro, salt and pepper to the bowl and toss.