I am experiencing a problem with my blinkers and emergency flashers. They worked up until I turned on the flashers and then quit working. I checked fuses and power coming from panel and it checks good. This happened before about a year ago and they started working again but about a week ago after using the flashers it started again. I am lost as to what I can do and can't find a wiring diagram for my 1989 F350, so I can trace the problem and maybe bypass it. I hope someone can help me. Thanks in advance

 

There are often wiring manuals on ebay...

I commiserate, the electrical problems IMO are the most frustrating.