2 dof with ibt 2 and smc 3 problems

Hello,
i build in the moment my 2 DOF with 2 ibt -2.
I use the Instruction from here
https://www.xsimulator.net/community/threads/smc3-arduino-3dof-motor-driver-and-windows-utilities.4957

I have change the arduino Code to mode 2.
I have conect the potis to the Motor in midl Position.
Now whene i start smc3 The Motors do nothing but until i turn on the potis the Motor run. But only in One Direction!! I have Check the wirering but its the same like the diagram in the Instruction posting.
what is wrong?


Pleace help me!

Greetings

This is my project.

I have 2 Bosch WhiperMotors
2 IBT 2
1 Arduino uno

But now a big new problem.
I have destroyed both ibt2 and the arduino becaus i have made a big fail :/
The new parts comes tomorrow.

But bevor this is hapend:

I have managed that at least the motor 1 moves in both directions
For the first time that the motor moves as it should be in the smc3 as a motion juhuuuuu


But unfortunately not in the area I would like so the path was much too small. I've changed the limits and nothing has changed. After that I pretended wildly and then nothing worked anymore.


The second motor didn't do anything yet. I then swapped the two ibt2s and it still didn't work. so one of the two is apparently already broken.
The second one that actually went got a short circuit because of me and since then it doesn't work either : /
and this was the moment when the arduino was died...



Luckily amazon delivers very quickly

The PC Powersuply is only for the cooling vents and my wind simulator.

Thank you for your hint!!!
As you can see in the picture, 3 cables come from my motor.
One ground one plus and one more.
I just cut the gnd off (it was on the motor housing).
So was that wrong? Is this where my fault lies?

Unfortunately I don't understand the drawing as it is meant

why does the + and - cable go from the power supply to the black cable on the motor?
and so i have to go to the housing with the + and what happens if there is electricity?
and if none of them flow? How does it have to be?





Edit:

the way I understand it.
Some wiper motors have the housing grounded, which is a problem when attached to a metal frame. If the motors run in opposite directions, your power supply will be shorted out. Which in turn destroys the motor h bridge


So I understand it that if I hang my continuity tester on one of the poles and then go to the housing, there should be no continuity.
That's the way it is.
if I of course use the brown mass cable then of course it is already like that.

Does that fit now? I don't know