1985 Cadillac Brougham turn signals and emergency flashers

both signals and emergency flashers stopped working at same time. new switches were put in a week before. they operated fine for about a week. then the drivers side front lower ball joint gave way and broke. which made suspension in front left drop down. mechanic shop locally replaced ball joint. by the time I got car home 20 miles,those lights quit working. I'm wondering what might have happened and how to fix it. thanks much. Barry