Just remove the connector from the switch s-005 and you will see why. 3 missing pins.
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I assume that the pcb is powered by pin 11 of X716 (5200) and then uses pin 3 of X720 (3187) to activate the pcb relay and give current to all components when the auto button is turned on
That would require a change of the pcb, because the on off connection on pcb is just making a connection to GND.
Print the pictures from finnish farmers (or open them in separate windows), and you should be able to get how he did it. (one of them are about the “safety switch”)
He has a ? mark on that pin number, but in a later post he writes this: It seems to be really common that the column switch is missing the contacts for X716:6 as I also had that same thing. That’s why I removed the pin 3 from X720 and connected that to X716:6.
Meaning that the NEW and CHANGED pin 6 on X716 is driving his little pcb safety system.
But he is not clear or have a schematic, that show how his small PCB makes a GND on the SW IN (see one of the photos) Another photo show a red wire from his small PCB to PCB v4 C1 (or ON)
Notice here: today with AOG V5 ++ it is no longer needed with a special transistor circuit for the pressure sensor, Hansdampf writes how some posts up 4 days ago.
But YES 11 is powering the PCB V4
In my case pin 6 was also not working, but pin 3 (3187) did. At first i had a Relay installed, which closed the connection between the on-off pins. The main problem i had was, i always had to reconnect my Pcb after the Relay on the PCB got activated or deactivated.
My solution was, i took the 12V from Pin 3 and used them to Power the isolation valve on the Orbitrol. Now i don’t have to reconnect all the time, and when switching the Switch off, Agopengps cant steer.
Probably due to this com issue for Nano clones: Arduino COM port issue
Note to future PCB makers: could those 2 pins be connected by default on the pcb!
And that way eliminate the problem for others.
In my setup, the pcb is powered with pin 11, so it has power always when tractor is on.
The little safety circuit that I’ve added is just a relay connected in series with the BTS output in pcb. This relays coil is powered with pin 6 in X716(witch has later been changed to pin 3 of the X 720). This allows me to be sure that the steer engage valve, controlled by BTS, is not going to get power if the column switch is off.
I have made a summary of everything you have commented:
It seems to me that it is clear to me that the pcb connects when turning the ignition key (pin 11 X716) but the orbitrol valve (6/2) only turns on when the switch of the rear column is activated, for which it can be taken the current from pin 3 of X720 and send it to 3168 of x710.
The was 3120 signal must be connected with a Y cable for the tractor ECU and for the navigation control, it is made in the connectors that are in the front part of the engine.
The signal from the pressure sensor (so that it disconnects the autoguidance when moving the steering wheel) 3160 is connected to the analog input of the arduino A0 (or A2 as published by Larsvest in an image in “AOG on Autosteer ready New Holland T6-175 year 2018” ) and no potentiometer or resistor needed for AOG V5, and it is set from AOG.
The pressure sensor must be supplied with + 5v from PCB to pin 29 on X716 (3167) and GND from PCB on pin 39 of X716 (3161)
I am not clear if the was also has to be fed from the PCB or is fed from another part of the tractor.
Thank you very much for all your teachings
I have made a summary of everything you have commented:
It seems to me that it is clear to me that the pcb connects when turning the ignition key (pin 11 X716) but the orbitrol valve (6/2) only turns on when the switch of the rear column is activated, for which it can be taken the current from pin 3 of X720 and send it to 3168 of x710.
Finnish farmer found the 3168 at the tractor ECU(see his photo, and find that connector under the small opening at right side by back window/behind your seat) but you can also use x710 connection as I did.
BUT the current from pin 3 is only activating a relay. which allows power from PCB4 to pass from the 6/2 system. You should not power 3168 directly from pin 3 of x720, because then the automatic on off for 6/2 valve does not work (6/2 output is only on when AOG autosteer is on/active)
The was 3120 signal must be connected with a Y cable for the tractor ECU and for the navigation control, it is made in the connectors that are in the front part of the engine.
Was can be done 2 ways: As I did, just stealing original signal(via Y connection) and still let tractor ecu feed the 5 V and GND.
Or as Finnish farmer feeding 5V and GND from PCB v4 ant giving only signal to tractor ecu (via Y connection) If you don´t give signal to tractor ecu, then you would not have automatic diff lock/unlock any more.
I use only one of the was wires in x716, and Finnish farmer use all 3 for was
The signal from the pressure sensor (so that it disconnects the autoguidance when moving the steering wheel) 3160 is connected to the analog input of the arduino A0 (or A2 as published by Larsvest in an image in “AOG on Autosteer ready New Holland T6-175 year 2018” ) and no potentiometer or resistor needed for AOG V5, and it is set from AOG.
Correct, except the info from me about A2 is no longer valid.
The pressure sensor must be supplied with + 5v from PCB to pin 29 on X716 (3167) and GND from PCB on pin 39 of X716 (3161)
I am not clear if the was also has to be fed from the PCB or is fed from another part of the tractor.
Thank you very much for all your teachings
I recommend doing as Finnish farmers, he has made the best solution, and I am going to make the same safety system for the CNH T6 -175, as he have for the 6/2 valve.
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Today i also received my connector for the built in harness, and started wiring my pcb.
I also stole the Pin 3168 from the Ecu, and my system is pretty much working, the only thing i’m not quite sure about is, should i add a extra button to trigger Steer on the Pcb, or did somebody find the connection to the Original Button from the tractor?
I did not even want to use the original steer button because it is positioned in odd place.
I have a foot switch on floor of the cad, wired under the floor mat all the way behind the seat to the pcb and connected to remote pins of the pcb.
I really do like the foot switch, because it can be moved a bit to drivers preferred position and you do not have anything else to do with your legs… Especially with cvx 
True, in my case i just printed a little Box for a Button, and i mounted it on the Command Arm
I think these are the right connectors for the WAS.
Yes, that is the type of connector, but be sure to check the “coding” of it is right. There is variations of how the spikes/grooves are positioned around the outside of the connector.
Rainy day so used the time to poke around warehouse and found the connector kit I bought from Finnish online store. The box had a website and part number in it’s label.
Connectors for case IH puma, new holland T7 WAS harness:
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could you put a picture of the bridge you made in the was?
Photo of the wiring:
And location in the tractor:
The signals is just soldered together. Unfortunately my brother used wrong wire color and therefore it doesn’t look so professional 
Thank you very much, I am still waiting for pieces to complete the pcb, I hope that before the fall sowing I have it ready.
I think you will need wire gnd too for diferential mode
Are you sure? As I understand it, the ground is everywhere, all the same ground and there should not be a need to wire it to ecu as it already has it. Besides @Larsvest got it working just by wiring the signal to aog pcb, so basically the other way around.
Or did I misunderstand what you mean by differential mode?
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