This is a high resolution copy of 4MR3112 Mack GENERAL R, U, DM (RD, RW, etc.) Wiring Diagram.  The diagram covers many Mack models with the R style cab, but it is considered as a general diagram as some models may differ slightly due to customer added options.  Printed size is 22"x28" and laminated with durable plastic.  This print is useful for wiring projects and also suitable for framing for your game room, garage or office!