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That would be correct. You close the control then open the supply or deflate solenoids appropriately to control tire pressure. That was my prototype. I put up a slide show of that original wiring(drawing and pics) In another youtube video On my channel. I do it a little differently with a...

I suspected as much, and that makes perfect sense, but have no observation to support it:)

Wouldn't even need a weatherproof box. Cut the connector at the tank and Install the 90-120PSI air compressor sw at the normal location at the tank and install new connections on the end of the wiring harness and weatherproof them to the switch. Splice the relay into the CTIS wiring harness...

Thats a tough one. Like the alternators, It is a pretty specific component, and the bandits know it. Thats why I like to throw out cost effective alternatives whenever I can:) The CTIS sw closes at 117 and doesn’t open again until 89PSI. But there are inexpensive off the shelf 90-120 PSI air...

that regulator looking thing is a protection valve. It works just like the wheel valves except it takes 85PSI on the wet tank side to open and allow air out, so it won’t let CTIS draw the wet tank below 85 PSI. y0u can(and should) confirm this with a gauge connected to the wet tank. The...

The manual does talk about 2 solid lights not flashing. Maybe yours is not flashing. As MR mikey mentioned the controllers can fail in weird ways. But it would be good to make sure you are delivering all the pre-requisite conditions. You say the air dryer purges, that means the governor...

You have followed the plumbing, left is “T” d to right and front is “T”d to rear. There is no way to send air to just one tire. In emergency mode, the timed routine is changed and the controller simply checks the tire pressure much more frequently and adds as necessary, instead of the normal 15...

The wheels all get fed air equally, so one tire not getting air indicates an issue with that one wheel alone. First check I would make is to insure the banjo bolt where the air line on the wheel connects to the hollow hub supply, is indeed a hollow banjo bolt with a cross hole. If a regular...

you can connect your air compressor to the front red emergency gladhand. It will charge the whole air system thru that port. It also releases the park brake so chock the wheels:) you can unscrew the vent nipple off of a vented gladhand cover. It is national pipe thread port on the cover and...

S is the air supply line in from the wet tank. D is the deflate port you will see a little pressure relief valve in that port. C connects down to the dump/quick release valves and wheel plumbing. The control solenoid vents the manifold into that bottom plastic cover. The line connected to...

The pressure control unit is the manifold that the controller manipulates to control the system. It is located under the passenger dash, an aluminum block with hoses connected to it and a black plastic cover on the bottom. It has 3 solenoid valves under that plastic cover. One is the control...

I don’t think accessing the CTIS controller with software is going to narrow down the trouble code any, as the system only has one sensor And a supply tank pressure switch to report air supply status... 5 flash means the controller did not see something within a set time, or it preformed a...