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That is interesting! I noticed that sometimes my pressure gets to 45 then drops pretty quickly. I just thought it was the CTIS system. Now when I activate the system I run it up to about 43 then shut it off and it holds. Strange!

That surprised me. When I replaced the manifold, with all the tires in the 40 psi range, I simply disconnected the air lines- no pressure anywhere and none of the tires deflated.

The task seemed easy enough when I started. Here are 2 pics of the manifold. Just 2 solenoids and I think a motor. The motor I think directs air to various axles, but I didn't get that far. I tried activating each solenoid but I still could not get air to pass thru. On the bottom are 4...

The manifold has like 2 or 3 solenoids, so I first thought why not just rig up a few switches to power the "up" solenoid when needed and the "sown" solenoid when needed. Once I got a manifold in my hands I realized that is not possible.

I replaced the manifold and console with new old stock and got her working, sort of. :roll: On a 20 minute trip it does its job fine, slower or less time it does not fill up completely and I am not happy. Also the next day it often lets a random tire deflate. Overall, I like the trucks...