I bought an entire rear axle assembly out of a wreck and they also gave me a small ECU to control the locker. It just doesn't look right to me because it's green and has a different plug than the one in this picture:



I'm suspecting maybe it's the transfer case controller that they gave me?

Or maybe it is right but just older than the one in Phong's write up?

 

Mine was also black. Nevermind the white "locker ECU" label on it--I made the label.

 

Thanks for posting that picture. Mine definitely doesn't look right. The plug has 16 terminals instead of the 10 I've been seeing in some of the wiring diagrams on the net.