I have a 2001
Jeep Cherokee Sport. It is NOT equipped with the transfer case that has full time 4WD. Anyway, when I shift into 4H or 4L the "PART TIME" light will not come on. It will engage into either gear, just the light won't come on. What makes the light come on? Is there a switch I can replace? This is my first Jeep and have only had it a short time, so your help is appreciated! THANK YOU!