Remington Mens Shaver Replacement Parts For Model MS3-2700

Hi Don, Thank you for your question. There is no wiring diagram, but here are some instructions from your owner's manual that may help you with the battery replacement. First unplug the shaver from both the electrical outlet and the shaver. Then remove the screen assembly by pressing the two side buttons until the head assembly pulls off. Then remove the four corner screws holding the upper housing in place. Squeeze the ends of the 2 blade assemblies to bring them into alignment with each other. Pull the housing upward to remove. Pry the 2 side panels and remove the single screw holding the back housing in place and pull the back housing off to expose the batteries. Take a note of how the battery assembly is installed and positioned in the shaver. Pry and lift the battery assembly up from the printed circuit board. Then cut the wires on both ends of each battery to remove them from the shaver. We hope this helps!