Three Stage Damper


I have a Four Trak 2.8 Deisel Registered in 1985. Next to the handbrake is a three position rocker switch labeled Three Stage Damper.
Can anyone tell me: What is is supposed to be connected to and what is it supposed to actually do?
I am the eleventh owner and it did not come with an Owners Manual.

if its origional shock

if its origional shock absorbers theres a solenoid valve on te top of each shock the switch changes the shock absorber setting , soft . medium and hard... your teeth rattle a bit less if its set on soft

Three stage Damper

Many thanks for that, I'll have a little peep underneath. I'd be interested to see if it has it's origional shocks, it certainly feels like it.