3-DC OUTLETS?
 

Have a 00 sierra slt problem i am having is the 3 dc outlets in the center console only one works looks like all are on same fuse but not sure. looking inside the three holes the two that are not working are different from the other looks like there is a black stoper/washer witha hole in the center is this a different power supply that the the other. working outlet looks like same old cig. lighter.