Car wiring diagrams: 3Pdt Footswitch Wiring Wiring Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Fig. shows a bottom view of the PDT foot switch. What the? Now let s look at a schematic representation of our bypass switching. Since the .The PDT stands for " poles, double throw". Here is a diagram showing the different possibilities SPDT DTDT footswitch schematic. Here, we can see that a .True bypass for s s wah wahs and other effects diagram Run a wire from PCB terminal up to PDT terminal and solder. Attach a short .