Actually, there are only two wires...a small one and a larger one. I kinda expected to see bigger wires considering its function.
Phil at FastLane verified that the unit he sent me has an internal regulator. After finally getting the old one out, I could compare them and verify that I have the correct unit.
The picture in the Haynes manual shows a compact alternator with a regulator mounted on the back of the case. So I got nervous when I compared the pic with the one that showed up at my door.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car