I am new to this forum and this is my first post so I hope I am posting in the right place. I just recently bought a 2003 F350 super duty dually 4x4 with the 6.0 deisel engine. The 4x4 is not working.The manual says when i turn the key on I should momentarly see the 4x4 light and the low range light,those are not showing up.When i flip the switch on the dash nothing happens either.I can only find 2 fuses in the manual that says anything about 4x4 and both have checked good.The hubs are set to auto.I forgot to mention it is automatic transmission. Any suggestions would be greatly appreciated. Thanks Curtis