Fourtrac front auto hub problems

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Hi

Hope someone can help me! I have an N reg Fourtrac forester and both front electronic automatic hubs have stopped engaging. It came out of four wheel drive fine then the next time I used it nothing. I've had it off the ground and checked both drive shafts are turning. I find it had hard to believe that both hubs would pack up at the same time, this leads me to think it maybe an electronic fault.

If anyone has any ideas I would much appreciate it!

They are purely mechanical

No electrics at all. Loads of good info on this site as to how to maintain and service autohubs. Easy job.

David T