Hello,

you can connect secondary satellite to the RUD port only.
Throttle must be connected to the AUX.

If you will use Y-harness, you can connect battery to the RUD (second free Y-harness cable).

In this way, it will work without any problem.
If you will need second power input, you can also use second Y-harness in the AUX.

If you are using classic receiver connection, then there are two power leads so you are feeding the unit from receiver.

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Spirit System developer