WD 45 was an excellent tractor. We used one for years on the farm. Would love to have one with a wide front end. Don't forget about the single hydraulic connection for different attachments. It will lift and gravity let's implement drop. Nice feature to have.

The switch you refer to beside the amp gauge is to increase the generator output (when you forget to turn the ignition on and almost drain the battery) or when working at night with the lights on. It increases the generator out from like (don't hold me to these numbers) 7.5 amps to 15. Keeps from just boiling the battery during those 12-20 hour days plowing or disking. Remember, that series started in the 1940's and came with magneto's. Automotive electrical systems have advanced a long way since then. The WD/WD-45 is my favorite tractor to this day right up until my right knee starts throbbing from bouncing against the fender bolt heads hour after hour. The hand clutch system should still be mandatory. As the gentleman who introduced me to those tractors used to say, "The most power you could buy for the money in the 1940's and still the most power for the money you can buy today"!!!!!

The lift arms are apart of the snap coupler hitch. Allis-Chalmers stopped using the snap coupler hitch in the 1960s as some early model 190XTs had the snap coupler hitch.

My son has a WD