ST-901 GPSS converter, help needed

[Alex G.]

I've recently purchased a ST-901 converter and I need some help with the connection.

I want to install it between my Sandel SN 3308 HSI and the Stec 60-2 autopilot to check if it works. The unit was previously used in a different installation, but the seller reconfigured it for my setup and marked the wires (see the attached pictures).

While most of the labels make sense, do you have any idea what the yellow wire is and where does it need to be connected?

 

[455 Bravo Uniform]

Gonna guess “GPSS over-ride” Pin 22 from the diagram, but to what?

Give STEC’s Scott Howard a call at 800-872-7832.