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Back to this old problem..... So back in September of 2021 I did the soapy water at the rear axle vent area and cycled the CTIS and no bubbles. So never found any cause of this problem and moved on. Well after 3,500 mile trip it's obvious it's still occurring occasionally. I just did another...

After finding the source of my small oil leak, it's coming out of the oil pressure switch. The original switch is the NASON 19207-12419189-002 or the short number is "12419189" mid west military's supply shows one with number 12419189-001 and it looks a different than mine, eastern surplus and...

Yes the ex brake disengages when the brake pedal is depressed. After doing real world testing I applied +12v to the k10 relay coil during ex braking and it did back feed and disengaged the ex brake. I then tested and found a single wire on plug J308 pin 7 that when you apply +12v directly to it...

Once again RONMAR you amaze me with your skills at reading wiring schematics. Just finished the test drive and you are correct pin 4 has 24v+ during ex brake engagement. Now to connect a 24vdc relay and hook it up to the brake lights. My initial thought was to apply 12+ to the trucks brake light...

Shout out to RONMAR for his posting of wire schematics and excellent advice and knowledge.

Well that project is finished. It was actually pretty straight forward after identifying the wires it was just a matter of splicing the four wires into a longer cable to the switch.

Well I hear the solenoid latch when warm up is turned on but K16 relay does not light up momentarily and no voltage on pin 4. So I’ll have to get a passenger and go for a test drive to test the theory.

Sorry to bug you again, for testing the wires purposes it would be easier to do while parked versus driving and looking at a volt meter while the exhaust brake is working. Would I get the same voltage on pin 4 just by hit the warm up switch to on?

Thanks RONMAR. After searching the internet I get a lot of conflicting answers to that subject. Some motorhomes have it, some fire trucks have it but most trucks / Semis do not. Some say it’s legal some as it’s not! My opinion is it’s safer for me to let someone know I’m slowing down abruptly...

Thanks again ronmar, your amazing skills at reading these schematics are far superior to mine. I’ve been looking at the schematic last night and today and I’m still having a difficult time understanding what’s going on. My simple question (if in fact it is simple) is, is there 12v+or- or...

Thanks ronmar I dug in this afternoon and found an empty plug behind the dash panel and it had the 1911 switch to 1911A and the 3020 switch to 1911B wires going to it. I jumpered them out and successfully got the CTIS OFF to illuminate and the CTIS turned on. Also take note there is another two...

I finally made it back home and working on trying to wire the exhaust brake to the brake lights on my 2003 M1078. I’ve been in the fuse panel trying to track down the exhaust brake relay that activates the solenoid. The relay labeled exhaust brake only comes on for a moment when it is first...

So do you agree I could just cut the power wire to pin H on the CTIS ECU and add a switch then locate the “CTIS Off” lights wire and so it illuminates when it’s off?

Mine is a 2003 M1078A1 and I’ve never found a power switch for the CTIS ECU.

I typically unplug my ECU when I'm not using the CTIS (in hopes to prolong its lifespan) but I hate the look of it and was going to just cut the power wire going to the ECU and install a switch so I can just turn it on or off when needed. Would there be any problem or reason I shouldn't do this...

Or take it to a cat service center. when I had those it turned out to be a sensor and then I would purchase it while I was there and put it on at home. They can also check everything else potentially going on and ask them to save your data in case you ECM goes bad.

After you have insurance, they’ll fix it with the big stone chip or crack in it!

I just swapped mine out “Twice” before my trip.😖 l ordered a set of cab bushings top and bottom from Memphis equipment because my bottom bushings were falling apart again. I replaced them all 6-7 years ago the top ones looked great but I figured while doing it go ahead and do too and bottom...

Interesting I’ll have to check mine when I get back home.

You’re amazing, how do you keep all that information in your head?