it could be deep inside the auto selector, have you had it apart?
jib
the switch is on the gearbox....about the size of the palm of your hand.
undid the 2 bolts and disconnect the cable at the splined shaft
don't worry about getting it back in the right place 'cos it's located by 2 flats.
drilled out the rivets ..7 off...split the cases and clean up the corroded contacts.
re- assembled with 4mm nuts and bolts instead of rivets...bunged it all back on, and job's a dream.
hope this helps any one else.
thanks guys
you've obviously seen my driving malcolm.
it should be the subject of another post..." clonking noise while reversing..."
well if they are going to put lamp posts so close to the road they've got to expect some casualties haven't they !