I have two signal cables connected to my Sabertooth 2x5. I use an Axon MCU.
The cables are very very bad (almost no solder, the solder is really bad, some parts are black because of the soldering iron).
When there's nothing connected to signal, there's nothing but the strong blue LED (everything is fine).
When I connect the signal cables to the Sabertooth, the LED's ok, but the motors start moving randomly, even if there's NOTHING on the other side of the cable (not even a turned-off Axon --- it's really nothing).
When I connect them to my turned-off Axon, it not only moves the motors randomly, but also the blue LED first glows dimly and then blinks strongly.
I intend to fix the cables tomorrow and tell here what happens. But, anyway, does anyone have a clue about what's happening?
PS: I don't know if this has something to do with it, but the robot chassis is made of aluminum and seems to be conducting electricity. I'm using spacers.