If there are 2 wires(red/black) attached to a pc case & on the connector end, the letters "KSP"

would you know where to stick it?

 

Sure its not SPK as in Speaker??

 

no its ksp tho it could be someones buggered up the printing.

Its like a rocker switch, when sliding off the side panel its there attached to the edge of the case infront of the psu. Maybe its a grounding thing)
There are 2 seperate wires one red one black & joins together into a flat connector (like those power/reset/ front led connectors)

just wondering whether im safe leaving it unplugged?

 

Could be a case access alarm then. Does the rocker switch get moved by the side panel?