I have a 72 Sub 12. I need an ign switch so I took the old one out. That was probably 6 months ago. I was thinking it would be a two day job. One to take it out and the next to get it and install it. Well the guy at NAPA looked at me funny when I ask for a switch. So the I let the tractor sit. Now I want to get it running. I entered my model number in sears parts direct. I printed the wiring diagram off and as I was looking at it, I noticed its not the same as the tractor. The diagram says that it has a solenoid. The tractor dose not have a solenoid and I dont think it has ever had a solenoid. The tractor is designed for the battery cable from the batt to go to the switch and from the switch to the starter. Sears Parts Direct says the batt cables go to the solenoid and then to the starter. The really odd thing is sears parts direct says it needs a 2210R switch which is what it needs but the diagram is wrong.