Behind the switch. If you take off the fuse panel and stick your head up there, you'll see it. Usually what happens is the solder joints on some of the components on the circuit board fail. Take it out, open it up, and take a look. On my last truck, all I had to do was touch up a couple of solder joints and it was good to go.
Mike
You got a pic? I looked at mine and cant find anything up there except for the back of the wiper and headlight switches. Went to PicAPart and the other 87's are the same. I even removed the fuse block from mine and theres nothing there.

