My 95 Explorer had no four wheel drive two weeks ago.The 4x4 light would come on but the auto hubs wouldnt engage.I installed Warn manual hubs and tested it up in the air,all was working.Well two days ago it snowed and i pushed the magic 4x4 button and NOTHING! No lights or four wheel drive.I can hear the solenoid clicking at the rear, but thats it..Any suggestions? Thanks for anything...