The Mack MR 2004 to 2007 Heavy Duty Headlight Dimmer Switch is a reliable and durable solution for replacing a failed original part. With a 20 Amp amperage rating and a 12V voltage, this non-illuminated switch features a 2-position rocker design and white indicator markings. It is sold individually and is a direct replacement for specific vehicle applications. Made from quality materials, this dimmer switch ensures long-lasting performance. Backed by a team of product experts with over a century of automotive experience, it fits most Mack MR models from 2004 to 2007. OE replacement numbers include Mack 25171770 and Mack 1MR4318AM2.