[Woodsmith]

I think this was mentioned in your other thread.

Your motor is supposed to have a low speed setting to keep the auto pressured up. That would mean the motor would be running when ever the key is on.
However, if you wire it to the 'running' or ignition position of the switch then it will start up the moment you turn the key. You might not want that as it could be in drive and start to move off on its own.

Maybe the 'crank' starter position is supposed to latch a relay that then stays on when you release the key. Perhaps that part isn't working.

Need to see photos of the wiring layout to work out what has been done.

Is there anyone local to you who can help you trace the wiring and see what is going on?

 

[Woodsmith]

For a temporary fix, so that you can work through the rest of the vehicle, use a switch.

Get a switch and connect one end of it to a 12V supply that is controlled by the ignition or accessories position of the key. Connect the other end to the wire that was on the cranking position of the key.

Then when you turn the key on you can flick the switch and make the motor 'idle'. You can then test everything else.

In the mean time you can either decide to keep the switch and fit it somewhere convenient or you can use the crank position on the key to work a latching relay.

I would go with the latching relay myself as it will auto off when you turn off the key.