Here is one for anyone.  I would like to know if anyone else has had this problem.  84GL, manual 4 speed.  It seems that if you push in on the top space contact of the backup light switch, you can cause it to become a short to the other contact.  I could not figure out why the switch worked but when I pushed the wires on, I basically had a bypassed short circuit (backup lights on when the ignition was turned on).  Finally found that if I pushed in on the top contact, I had the short and if I pulled out a little on the contact after pushing the wire on, the short went away and the switch operated normally.  Is this characteristic of the switch failure mode?

William