Wiper relay dilemma

Here is my problem. My wipers do not work on intermittent and do not seat properly. I read in a post that the wiper relay is the culprit. So, I am trying to use the wiper relay out of my parts car. My manual does not help me locate the wiper relay in either my 82 500 SL or my 76 450 SL parts car, though. So I pulled every relay I could find and am trying to find the wiper relay through the part number. Anyone have a better idea on where it is or what it looks like?

I guess another thought would be to trace the wires from the wiper motor to the relay. Problem with that is that the wires are taped in large groups, and to tear them apart you have a pile of spaghetti on your hands.

Rich Mayer
82 500 SL