I have a 1999 Ford Superduty the brake lights and turn signals quit working. It blew the fuze, when I replaced the fuze they still did not work. I found the problem to be a defective turn signal switch. I think the same switch is used on the entire ford truck line-up. It only took me about 30 minutes to replace the swicth. I Hope this imformation saves fellow plowers some time and $$$$$$.