Spirit System

I have the original Spirit. It is updated with new firmware. I have a new Geolink, updated firmware and compas calibrated successfully. I made a cable for the RUD connection to a satellite receiver. + to +, - to- and signal lead to signal lead. This does not work. Is there a special Spirit System cable to connect the Geolink or a second Spektrum satellite to this Spirit?

Unfortunately this will likely burn up your satellite or possibly damage also Spirit unit.
You have to proceed according instructions that are in Spirit manual.

Regarding Spektrum satellite you have to use Spektrum Adapter V2 or Spektrum Adapter Multi for 2 satellites.

Your question was answered to your email too.