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Correct. They didn't work too well anyway

I'd assume they are the same. The earlier trucks don't have the rubber donuts at the rear cab though... If I'm not mistaken

I can take some tomorrow of my C7 that should be very close to the 3126 you've got

I was wondering if you guys know a source for these rubber donuts , which hold the cab. Mine are pretty much gone due to the fact that my truck doesn't have air bags on the cab. I also need the two that go on the rear latch

Oh wow that's good to know. The engine fan and ext cooling fan circuit breaker are missing. And when I put in a fuse to test, I get a check engine light after a few minutes. I guess I have to investigate this.

I have not seen a manual on my MSD.

One of the major differences is the fact that early cabs and truckbeds were not galvanized. These trucks had holes from rust whilst they were sitting at the Sealey plant waiting to be installed. The DoD made Stewart&Stevenson give a 10 year warranty on the cabs and fix damages. Most were patched...

Well thanks a lot for the clarication , now how about pointing out what the missing breakers are for?

yeah that would work ... Although it's wrong

Can someone help me with a picture of what these missing fuses are for? I am not just missing the two fuses , but also the cover for pod 4. Does anyone have the cover as a spare for sale?

So thanks to all of your help, some troubleshoot and most importantly thanks to NV555, the CTIS came back to life. just as we assumed already, it was the pressure sensor, which is mounted at the valve block. update: with the CTIS working, the air dryer purges a lot more. Maybe that will take...

I do get a signal spray when the system reaches pressure. If the truck never had the tanks drained , then there could be a lot of water in the system. A sham shields mission is to do the least amount of work possible. Ask me how I know.

AAA with premium will NOT tow it. I know that from experience.

I have a gazillion things I need to go through, still. And If the air dryer filter doesn't need to be one of the things I have to spend money on right now, I'd prefer not to. Still got to change all fluids, filters. get the transmission fluid changed to OEM Allison recommended fluid and so on...

How do find out whether I need to change it?

I have a 2006 M1089A1, they only come with one style of airdryer in those years . The finned type was a thing of the 90's, if I'm not mistaken. i was asking about a) how to drain it ( think by using a 5/16 square drive) b) how to make sure it's not clogged then I can still decide whether I...

Do I understand it correctly, that to drain the air dryer and 'make sure it's not clogged' involves a 5/16 square drive? I don't know how else to make sure it's not clogged

that's correct, But it also has a shut off. If there is no pressure it won't even switch any resistance. Therefore, unless system pressure is building it won't even turn the CTIS on. Once the ECU senses a change it monitors the values. or throws an error code.

The variable pressure sender.