Here's a few pictures of my install. I bought my fan a few years ago for $100 on ebay. It is mounted on a 3 core champion radiator.

As far as testing Heavy 12v pos. and neg and then a 12v trigger wire. I have the schmatic for hooking up the wires. Just not sure if it would be safe to check without the controller.

I also had to clearance my waterpump shaft and bolts to make it fit.

I also have the controller to run it but would like the plug to make the install look neater.

Feets, you wouldn't happen to know the part no. I need. Also I wouldn't mind buying it off you since there are no close MB dealerships to me.