My L2900 starts with the key but does not shuts off the engine. I have use the pull knob to kill the engine. Plus, the Glow Plug light comes ON or not when the key is in the ON position. Other times; the light does not go out after waiting 2 minutes. Once I start the tractor; it will go OFF. Other times; it comes on while running...,,,,,well, it has a mind of its own. The tractor runs fine but I will like to fix the problem. I checked connections from the switch - there are fine. Mike