My 4wd won't go back to 2wd and sometimes the windows and radio do not work. Are they related to each other and what do I need to do to fix it. The 4wd service light also comes on. I have tried removing the fuse, and also starting it run it through the gears putting it in nuetral and shutting it off. But still the light for the 2wd won't come on. What can I do?