Hello, I'm Chris, a current Ford Lincoln Mercury employee.
Thanks for visiting Just Answer. I will do my very best to help you resolve your concerns by asking questions if needed then suppling a answer. Gaining your TRUST in myself and knowledge is my goal. I try my hardest to respond in a timely matter and I will respond to any reply anytime I am on line.
Yes they are prewired and all the fuses and relays should be there already as well. The key must be on while using the switches. The wires are below the steering column.