Can anyone tell me(or show me in a picture) where the Ac relay is or the Klima relay for a 300SD?

I once saw a picture of the relay labeled on the net and wasn't smart enough to save it.

My compressor clutch doesn't engage. Have jumped both pressure switches without success. Tested leads coming to pressure switches and there is no power. When compressor hooked up directly to power source clutch engages so I know it is working. Seems to me it is either the ACC unit or a relay that goes to the pressure switches and the compressor clutch.
I would appreciate a diagram with the relays labeled and a diagram/description of where the Klima relay is. Please hurry! I have a black Benz and have already lost 10lbs (I wish) due to dehydration!