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Installed new cab suspension in our M1078A1. Stuck with the factory 'knock off' from MME. It is a shame as ours look in good shape, held air, only the bushings appear to be bad. If I can figure out how to replace the internal shock bushing and find a concave donut bushing I'll rebuild and...

That sounds nice and likely will look good. In the spirit of this thread would it make sense to create a patch and switch box to take advantage of the different programing? Within the patch box you could reroute the wiring as needed and enable switching the ground and power routes to take...

Replaced the dash parking hand controlled valves. The lack of leaking right near the driver led us to find the engine fan solenoid was leaking, too. Now the front and rear air systems pressures are up while running and are holding for hours while sitting. Much less annoying buzzing—

All good. You all likely no better than I. I got 0 ohms for the 'G' and 'X' tests at the P110 connector to the CTIS ECU—

Ran out and checked resistance between 'F' (ground) and 'B', 'C', and 'R' (inflate, deflate and control) all 64ohms; between 'H' (power) and 'B', 'C', and 'R' (inflate, deflate and control) all 150ohms. @Lostchain what were you expecting? edit: l'll try that— re edit: my resistors are blown...

I haven't. Why to look at 'D' neither ECU uses it?

It is a win assuming we keep our resistors healthy. The M939A2CTIS ECU (black) we received from a link @GeneralDisorder shared (thank you General) I believe is NOS. Came boxed and wrapped, still looks brand new. We originally saw 55# highway pressure. The unit connects right up to the DPA...

Welcome. This is a great site filled with folks willing to share their massive knowledge base. I learn something every time I visit—

Now for the rest of the story: After using our plaza Arduino CTIS ECU for a while we decided to swap in our Dana Spicer M939A2 CTIS ECU and reprogram it. The plaza unit is great and works fine we just want both units setup the same so to have a backup, and the Dana Spicer unit being push...

Thinking about how everything lines up and wishing to minimize changes to the M1078A1's wiring harness I decided to pull the 'G', 'W', and 'X' pins from the M939A2 CTIS ECU connector. Once I had pulled all three (matching the plaza Arduino CTIS, too) the ABS fault code dropped, and our...

Yes. The same issues, See this earlier post hunting for ABS solutions—

Following up on the schematics. It appears the M1078A1 and M939A2 wiring harnesses routed a few items differently at what appears to be the (M1078A1's P110) connector to the CTIS ECU. Since @GeneralDisorder has suggested the Dana Spicer ECU's do not connect across J1939 and we can connect to...

Ours seems to complain with an ABS light when the M939A2 Dana Spicer ECU is plugged in. Unplugging it turns off the ABS light. I believe the M939A2 CTIS ECU is sending something on a conflicting path for the M1078A1—

Well, I (the other burnt resistor member) had an interesting experience today and was just coming in to make an M1078 CTIS schematic to M939A2 CTIS schematic. Since replacing the resistors we have been using our plaza Arduino CTIS controller. Today while replacing the dash air brake hand...

Once he hooks up diagnostics I am rooting for code 32 or 35—

I may not understand the CTIS operation, nor the pnuematic issues well. Though perhaps the issue is between the supply tank and PCU, not between PCU and tires?

My brothers and I still say, "No photos, no story. Didn't happen." We need photographs of your new tinker toy and trip—

Has anyone tried using the hydraulic kneeling cylinders to level the vehicle when parked?

Are we comparing STC (Standard Test Conditions) rating as panels are sold or NMOT (Nominal Module Operating Temperature) rating as they more likely perform real world? The STC rating for these 5 LG panels appears to be 2,200W. The NMOT rating appears the be 1,670W. If he mounts them with air...

I keep forgetting to look at rronmar Youtubes. When I remember they are very enlightening. Thank you–