Hi,Oz.
To get the valves at the wheels to work (if they do ? LOL ) you need 12 to 26 psi. to work. So you set the regulator at (lets say 35 Psi.) and then open the the line to the tire/ tires. System only does the 4 tires . You can't pick witch one. This was all done with a PC that has been a P.I.T.A's. Good when new but not so much now. ( 25 + years) Now the system is filling up to 35 Psi. It needs to be confirmed with a good tire Psi. gauge at the tires. Their is a little difference and you need to work that out. Its the different between gauges thing. When you work out the setting for the cab,you will then close the fill line (supply) and then just open the vent line to close the line valves in the system . ( Tires and chassis ) Then close it after the venting. To drop the air pressure in the tires you will open the line to the tire like you were filling it and then back off the regulator to a number less than ,say 20 psi. Still working this part out but I think I can also open the vent line to help get the the tire down to the 20 Psi. range. When it starts to hold Psi. at the cab. ( may need to play with the open or closed of the vent valve ? ) Close the supply line and the vent line. Now reset the regulator to 20 + Psi. lets say 25 Psi. The system need some Psi. to keep the vales open to deflate. When you get to 20 Psi. +- ( after checking at the tires ) Close the fill valve and open and close the vent valve. Now your at 20 Psi. +- .
Now the forward mounted switches are for lights. (12-24 volt ) The switch looking "Clippard's " are valves for air control..
Now you want to go back on-road. Reset the regulator to 55+ Psi. ( I will use 60 - 65 psi ) and open the line to the tires and refill the tires. Takes some time (say 2 to 7 min's ) Very big tires ! After some testing you will find the right number at the dash. You just close the tire line/supply and open the vent . Then close the vent and your good to go.
To test or see what the tire pressure is just open the tire / supply line and read the gauge then close the tire / supply line valve.
I think ? LOL
