The way It was explained the 2 pin was for the second unit 2 motors without the board. Since I did not get a good explanation from their tech. I went with using the second 4 Pin for the two motors in the B unit. I had already of wired the two motors, 3r pick ups and ground into the one 4 pin connector. Because it was 0100 and tired. I inadvertently wired all four motors into the same 4 pin. Adriatic: You have to remember that this is a conventional engine and board. There is not any ID.
I ran the engines under load for 2 hrs last night/early this morning and again after I got everybody to school. Starting at 0930 until 1400 when I left to pick up my daughter from school. It only stalled once and that was at my problem curve. Another thing I might due is to remove some weight from the engines. Like my Atlas and weavers they heavy. When I removed the lead weights from the weavers, It took less Amps and voltage to run the engines without sacrificing traction.
Doug
