I can not get rear brake lights to work on my 4wd Ram. Brake and ABS warning lights are frequently on, always together. Sometimes however they will turn off, again together. Don't know that this has anything to do with no rear brake lights. Checked fuse panel, 40A labeled ABS was OK. Only brake related fuse noted. Brakes do feel a bit soft/spongy but they do work. Have to travel cross country at night next week, would really like rear brake lights to work. Any suggestions?