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JC, I think I miss-typed in my prior posts. I was working with the Pneumatic Control Unit (PCU) on the floor of the cab. In this case mentioned above, I was able to identify and replace a bad coil. Apparently, they do go bad. I have also had other issues with the CTIS system but at least...

Yes. Once I put the new 5C-13-K24 coil in, everything worked just fine. The system started out with the flashing highwy light like it should. I ran the truck for about 1/2 hour and let the system do its thing. At first, I was concerned that the system wasn't working because it cycled several...

I just wanted to post an update on this. I was able to find a coil that worked to repair the bad coil. I called the original manufacturer of the coil, Peter Paul. The said the part number I had was was very old but, unfortunately, they were not able to give me a good cross reference. I looked up...

So... I pulled the PMU out this weekend and measured the resistance on the pins per the troubleshooting manual. Two of the coils are are OK but the control coil reads open circuit. Also... it appears that this coil has been replaced sometime in the past (old one cut off and spliced in with crimp...

Thanks for the update on this. I'll look into the PCU and see if this fixes it.

Looks like I have a truck with the same issue... No lights unless I hold a button down. Did anyone ever determine what causes this? Thanks, Don