Hello Again I am posting here hoping someone might know something about this system. I am pretty sure the Solenoid on the Differential is bad (tests as a dead short) my question is the "relay" that powers it I thought I read supplies 12v and then drops voltage to maintain IE 12v to 3v anyone have any ideas I tested the voltage out of the relay its 12v and never drops. the Book say dont test it to long because it will over heat and burn up, so I would like to test the relay. to make sure it does not burn up a new 300 dollar part anyone have any idea how to test that relay???