Hello to all! I have a 2001 Ford Explorer Sport SOHC 4. 0L V6 with a 4x4 problem. Possibly the 4x4 switch? When i turn the 4x4 switch to either 4hi or 4lo the lights on the dash do not light up and the 4x4 motor does not engage? If I turn the 4x4 switch to either 4hi or 4lo shouldn't the light on the dash turn on EVEN IF there is a problem somewhere else beyond a blown fuse? The 4x4 fuses on the side of the dash and the ones under the hood are good. I read online about a relay that is on the firewall, sort of a vacuum type device that may also be a culprit? Any help would be greatly appreciated. Thank you in advance for any replies!