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The harness gets its power directly from the battery, bypassing the rx. All the rx sends is the signal. Really this is all the rx needs to do, but for the sake of convenience you pick up your power and ground there too. This is good for a few reasons. You get less voltage drop going straight to source for your power, theres no fear of over loading the small circuitry in the rx from amperage spikes, cleaner signal from not having to deal with possible rf interference from the amperage damping up and down to make the servo(s) move. It's really a good deal. And it's simple to boot. Hook it up to your steering channel, get your servos in sync via the linkage/ adjustable horn, set EPA,trim and sub trim like normal for one servo. No messing with two channels. Now this is really only helpful on twin servo set ups that are slaved together. If you use a right/ left set up you wouldn't necessarily use this as you can set up steer braking, different angle bias depending on TX input, 4wheel steer, crab steer and the like. We just don't need all that in our rigs. Channel mixing can be a pain, look at what we just went through with the 7px to master slave a servo. Can it be done, yep, is it a pain for us who don't normally use these settings, yep. So the harness takes all the fuss out if it. Bit more expensive up front, but saves the anguish in the long run.... just think of what you may have to go through if your tx crapped out.
