DRDIODE

[DRDIODE]

I have been tasked to attach an Encoder, AndyMark No. AM-0180 to a Tough Go Mini Gear Box. I accomplished that with no problems. Had to tap the small holes to 2-56 thread. What I want to know and I have been all over the FRC papers and AndyMark technical papers is how to hook-up the Encoder to the Side Car? There are four wires connected to the US Digital E4P Encoder. 1-is for +5 Volts DC, 2-is A Channel, 3-is for GND and 4- is B Channel.
On the Side Car there is three pins for a Molex connector. How is the fourth wire connected? Please.