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