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Thanks for the editing guys!

Thanks, she is still working like a charm. In the future I think I will install a 24vdc electric solenoid valve inline to the front tires so I can cut them out of the system when needed. That way I can leave the front tires at my desired pressure and just adjust the rear. And since this truck is...

Got it working Well I got my CTIS system working now for the first time, And I thought I would describe how I was able to track down the problem(s) just in case anyone else is having similar issues. First I put a gauge inline at where the black nylon output line comes out of, the cab mounted...

Thanks, I do unplug and plug it in every time I mess with it or try to get it to work. Actually that was the first thing I did when I picked them up from GLS yard as all the trucks had flat tires at various stages of air pressure. I didn't think about the governor though, So maybe the system...

I now have 3 939A2s and none as of yet have a working CTIS system, and none have ever worked since I have owned them. All 3 now have the 5 flashing light deal. After the first two trucks didnt work I was just going to give up on them since they are wreckers and I dont need different pressure...