Diff lock ????? 660 Grizzly

[hadster]

A friend of mine has a 2005 660 Grizzly with fairly low km. Today we where out and when he locked his front diff in it seemed to go in just fine and the light on the dash came on, but only 1 front wheel would spin. No unusual sounds at all, we have no idea how long it has been this way.
Does anyone have an idea of what may be wrong??????

 

[medler]

same thing has happened to my buddies I could be the shift fork in the front housing

 

[hadster]

Turns out it is the cv joint broken, so he's out for this weekend.