I recently replaced the coil,starter solenoid,points,condenser,plugs,cap and rotor on my case 600 tractor. It ran fine for a day, when I went out to start it again it would not start. The battery has a good charge on it, the solenoid clicks but the starter does not engage. There is a whine to it when i try to start it but no engagement. Could it be the starter or maybe something else? Is there a easy way to check the starter without taking it off the tractor?