Here is a cheap alternative to those $500 controller boxes at the plow dealership that are never in stock this time of year. Rated at 12volts and 40 amps these variable speed controllers will handle any salt spreader motor. You will need one per motor on your system. Auger/ flight chain and spinner. Some people use an on/off switch for auger/ flight chain and just have a variable speed for the spinner. I am in Hagerstown, Martinsburg, Mount Airy, Frederick and Damascus areas all the time. Could possibly meet you somewhere if need be. Asking $100 each. Call