I got a running 643 diesel Kubota 3 cyl engine and wiring harness with it. It came with a 643 bobcat minus everything on top of the tub. Also the drive motor were also gone. My question is basically I can see no reason the harness from this would not work on a 743 the only difference is 3 cylinders verses 4 and the glow plus just hook up in one place. I am putting together a testing stand to run V2203, V1703, and V1702's on after I rebuild them or just to test them as I have purchased a few that I was not able to hear them run.