Since I have been asked abuot this a few times and understand that it may be difficult for non-Swedish speaking people to follow the discussions in our forum I thought I would try a simple summation of the matter. The automatic transmission for Scania TGB30 / 40 is relatively easy to operate manually (with electric voltage). The easiest way is to locate the electrical connection piece to the right in the fuse panel located at the dashboard (see picture).
This connectionpiece contains all the cables required for control of the gearbox(cables number 18, 18A, 503, 521, 522, 523 and cable numb