A couple weeks ago I had posted that my ESOF was not working on my truck. The transfer case engaged, the lights on the panel came on, but the hubs did not lock. If I locked them manually, we were in business. Fast forward to today. I went to put the truck in 4x4 with the ESOF dial and got nothing. Transfer case did not engage, no lights on theinstrument panel, nothing. I can live with having to lock the hubs. I figure that is a bad vacuum line or relay somewhere--no biggie. I'll fix that but it is not a priority at the moment. What is a problem is no 4x4 at all. I checked all the fuses under the dash but everything associated with the 4x4 checks out. What to look for next?

 

Seems as though this is going to be an intermittent problem. On the way into work today, I tried switching into 4x4 just to see what would happen. I was able to get the T-case to engage both high and low range. I'm not sure if not going in last night was just a freak occurence or what. I hope so, cause intermittent problemsare the hardest to track down!