THE KNOB COMES OFF BY PULLING STRAIGHT BACK.THIS WILL REVEAL A LARGE NUT (I THINK 27MM)SLIP JOINT PLIERS WILL REMOVE NUT.
GIVE THE SWITCH A TWIST AND PULL FORWARD AND IT WILL HANG DOWN THROUGH THE FOOT WELL AREA WHERE YOU CAN REMOVE WIRING.
EACH CONNECTION ON SWITCH IS NUMBERED SO AS YOU REMOVE A WIRE FROM YOUR EXISTING SWITCH YOU CAN ATTACH IT TO THE REPLACEMENT SWITCH.(THIS PART OF THE JOB IS BEST DONE WITH THE BATTERY NEG. CABLE REMOVED.)
MF