When I start driving I can hear a ratched sound coming from the rear diff, but the locker doesn't work. When the difflock is switched off the diff is quiet.
Does anyone have some spare parts for this locker? Or any other suggestions?
It sounds like your indicator switch is working, if the light does not continue to flash on your dashboard, but burns solid.
Then it is most likely that the actuator switch is also working, given that the "ratchet sound" is quiet when you disengage the locker.
The "ratchet sound" is bad news, I am pretty confident the teath inside are broken.
For a second hand part, call Dawid at oh, eight, 3, four99, 15 double-eight.
But then go to a strongly recommended specialist for the installation.
This is not a job that just any mackie can do.
Also, once fixed, get into the habit of activating the locker once a week. It keeps all working parts in moving / working order.