Rear Differential Lock not Engaging

[nnnswordfish]

Hi, Rear Differential Lock is Not Engaging, Diff lock red light blinking. It was working around Month Ago when I last used it. Any tips Guys what to do? I have tried to drive forward/backward, and steer left and right but nothing Helps. Temperatures drop significantly in my country and maybe something stuck in actuator?

 

[Towpack]

Can you hear any noise from the actuator when it's trying to engage? Testing the electrical connections should be easy enough. You could try tapping the actuator body with diff lock selected but if it is stuck or seized it will probably require removing and stripping/cleaning. Getting the thing off in one piece can be a job in itself! Years of weathering and corrosion usually turns the casing into a sort of Alloy Crumble which just falls apart if you stare at it for too long.