Thanks for the response,
When I opened it up, I saw those holes, and I have the relevant gear and encoder. The Magellan II comes with a new motor-control board to replace the existing one, and has two 4-pin connectors, one for motor control, one for the encoder, but not labeled. The existing RA motor has that interface, and is quite heavily geared down, so I'd assume it's kept for precise tracking and slewing, but I don't know, so I'm trying to find the instructions. Unfortunately, it seems the installation manual for the LX50 doesn't have an equivalent process, so I'm stuck trying to find the Starfinder one, which doesn't seem to exist online, especially not the 16 inch version. Of course, the one part that can fry everything is the one thing without labels.
Edited by Tkoffeh, 22 June 2021 - 05:04 PM.