Cruise control?
 

My cruise in my 87 420sel worked exactly 1 time for me since I got it. The day I drove it for the first time it worked great but hasn't worked since. Is there a seperate fuse somewhere? I replaced all of the fuses in the box. What am I missing?

Use the search and you'll find lots of discussion on the cruise amplifier, re-soldering, etc. Got to be the worst POS of electronics on the car. I think they were made by VDO and GM over the years.