Ok so I am new to the Xj. I sold my Yj and went bigger due to a new baby. So I bought a 90 XJ 4.0 automatic. one of many issues is the Part Time light is always on. I know for a fact it is not engaged because i just got the 4wheel drive to work. Had a vacuum issue. I am famillier with the I6 and transfer-case, but not the AW4 or all the lights and whistles. Any idea why the light would stay on? Thanks