Hello. 4x4 lights don't illuminate when I turn the truck on. They don't illuminate when I turn the round dial. I don't feel or hear anything engage when I turn the dial. I've checked the 30amp fuse #20 and it's fine too. The first time I turned the truck on last week when I first got it I did see the light turn on when I turned the dial. Now it doesn't. Thx these are all the codes I have left. Thanks