The McCormick 3145937R1 is a genuine light switch designed for a wide range of McCormick, Case IH, and David Brown agricultural tractors. This essential electrical component controls various lighting functions including position lights, dipped beam, main beam, front work lights, and rear work lights. Operating at 12V, the switch features 10 terminals, ensuring reliable electrical connections. It is an OEM replacement part, guaranteeing proper fit and function for specified models.