I've searched the forum and can't find my answer. my boss has an 06 F150 king ranch 4x4 and his 4x4 light lights up when he starts his truck but don't do anything when he switches to 4x4. His truck switches into 4x4 most of the time but the light will only come on in 4x4 low. Any idea what the problem could be? He's not on the forum so I'm trying to get him pointed in the right direction. any info would be awesome.

 

Have him check all the Vac hose's he may have a leak.

 

Ok thanks for the info