I was wrong (don't tell the wife that I admitted that) left is on.
When you rock it left it returns to middle, does yours stay right when you turn it off? Just checking to see if the switch works.
If the switch works go drive 50mph some where, turn the switch on and rock the hand controls down, up, down. At first my cruise seems like it is not working; i slow down quite a bit, but then it speeds back up.