i just bought a 95 80 series and the cdl light on the dash never illuminates. when i turn on they key all the lights come on except that one. When i put the truck in low the cdl def does not engage because it will not cross the ditch in front of my house because of the front tires not wanting to spin. Occasionaly if i ride it aound in low the abs light will illuminate but when i got back to the ditch and get to spinning it goes away. should i hear an actuator or anything when i pull it in low? because i hear nothing although i am half deaf haha.