Just to clarify, I get the reading only on a way, if I invert the polarity reading on the meter I always get a 0. I don't know if it's normal, but just to be sure.

It's a transformer made by theĀ famous technician / repairer that made the EQMod cable.

Well, I don't know if this can matter, but at this moment most probably I think it does: I bought this mount used and I firstly used if with a 3A transformer that had no ground connection; on the very first use probably by a very unlucky event, the mount phisically burned the controller and also part of the handbox. The person I bought the mount from works for a very very famous european webshop and gave me the contacts for the technician that works with them but also on his own and he's very famous, at least in the italian astronomical community. He changed the controlled, as it was burned beyond repair, but verified that the other electronics, including motors, worked fine; he made the 7A transfomer robust enough to withstand any electrical problem and the EQMod cable. Since then the mount works absolutely fine, except for these errors I found thank to you, but I don't know if there were before the accident and if this event relates to the errors

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