Fisher wiring diagrams are available on Fisher's official site or in the parts diagram section of Ash Supply Co.'s website. The available diagrams are for the wiring systems in snow plows.
Fisher provides a 2-year manufacturer's warranty on its snow plows, and following a wiring diagram to make repairs voids that warranty. Even modifications required by state or local government void the warranty. Using a home snow plow of commercial use also voids the warranty. Attaching the plow to a vehicle does not void its warranty, but the plow operator assumes responsibility for any damage done.
Ash Supply Co. offers parts diagrams for other snow plow brands in addition to Fisher, as well as diagrams of non-electrical parts from both manufacturers. Ash Supply Co. is a New Hampshire-based retailer of snow plow parts and accessories, and it sells products in the 48 contiguous states and Alaska. It does not sell internationally though, including Canada.
Fisher sells its snow plows throughout North America, as well as in Europe and China. Fisher and competing brands Western, Blizzard and SnowEx are all owned by the same parent company, Douglas Dynamics. Douglas Dynamics owns non-competing companies TurfEx and SweepEx in addition to its snow plow business.