This is bar none the best controller on the market for your 4 pin white connector FISHER straight blade snowplows. FISHER stuffs their controllers with Chinese parts that have a very high rate of failure and parts are very expensive to replace. This is an all USA sourced and made controller that uses readily available and affordable parts. If you need to rely on your equipment, THIS controller is the solution. This is a superior quality controller for much lower cost than factory FISHER. That's a textbook win-win scenario.