Outer Limits 4x4 Board

Can anyone let me know what may be the issue with my rear diff lock.
The compensor does not come on and I have checked the switch and the power and all is OK. Is there a way to check the compressor on it's own and how do you get to it? Thanks Glen

In a shorty, I think the compressor is behind the "wheel arch" on the passenger's side rear - not sure how you get to it.

From memory, the compressor won't activate if the transfer isn't in 4wd - so you need to make sure all your dash lights are working properly. If not, the ECU may not know that 4wd has been selected.