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The stock horn on my LMTV was lame. @GeneralDisorder turned me on to an LMTV A1P2 air horn. All I had to do to mount this was cut a small peice of angle iron to attach it to the stock horn mount. It reuses the stock horn wiring and has the correct connectors already. I made a T fitting to tap...

https://www.steelsoldiers.com/threads/clogged-fuel-tank-vent-m1078a1.208153/

As mentioned in post 639 of the below thread, on my truck, the TPS comes from the J1587( J1708 ) Databus, so fiddling with J1939 is not going to help you. https://www.steelsoldiers.com/threads/eco-hubs-who-needs-3-07-gears.213516/post-2576768 I would recommend reviewing the Schematics for the...

Awesome!

So what I learned building my harness is that if you don’t have power going into the blackout pin, the display will stay off. So you should check for +24 at pins “S” (blackout) & “H” (ignition switched power) and then a good ground at “F” and “P”(reference ground). Check for these at the truck...

I have not run across one of those yet. I haven’t made it through my pile though so we will see. That’s the only code (from my reading) that Dana documentation points to a faulty controller. @GeneralDisorder has a compelling theory that when you change the config pins to over write the internal...

It’s pretty common apparently to get water intrusion in the 10 pin connector area of the CTIS harness and PCU, as well as grounding problems up at the dash and where the controller bolts to the panel. That little ground wire that is supposed to be clamped under the controller is actually the...

CTIS is one of the coolest features on our trucks. I’ve been wanting to make a bench testing harness for quite some time, and I finally got around to it. It’s part of the forum lore around here that the controllers are unreliable. In practice I think they are extremely robust. I bought a pile of...

Hello, you were correct on this action, I just verified with an M939A2 676422 controller that internal to the controller Pins “H” (power in) is shorted to pin “X” (J1939-) and that has got to be why your resisters fried, getting 24V straight to the bus. I checked multiple LMTV controllers and...

This is starting to read like Route 66 in the Grapes of Wrath! Good luck man!

According to CAT it de-rates at high enough altitude. I am speculating here that it controls smoke at higher altitudes, but I don’t have access to CATs programming to know for sure. They designed the engine, called for that component on the higher HP tunes, and throw a code when it isn’t there...

This was answered on post 32 here. https://www.steelsoldiers.com/threads/2003-m1078a1-3126b-330-horsepower-flash.212209/post-2485235

As you can see in the below screenshot, descending a steep grade in “2” on the keypad (1 as far as the Allison is concerned) has the transmission locked up and wire #132 enabled. Input speed and turbine speed are within an rpm of each other so that also confirms lockup. side note: TPS appears to...

I would do the ECO hubs first and decide on the final drive ratio later. 3.07s won’t be unusable by any stretch of the imagination.

What you would do here is just lock the truck in 2nd gear and let the exhaust brake do its thing. I just tested this on my ECO hub truck with stock gears and the exhaust brake was effective to just below 10mph, with your 3.07s 2nd gear would have a very nice effective range for the situation you...

In my A1 truck If you manually downshift to 2nd gear the pac brake will kick back on, default programming is requesting only 3rd gear automatically. Have you tried that on yours?

Yes that is it. You will have a special jumper to connect the cable ends that used to go into that box. The power for the ECM goes through that and problems with the box or wiring could cause the “engine switch off” symptoms the OP describes. As it is bolted directly to the engine, depending on...

Sounds awesome, can you share some pictures?

1st two things to check from the 3126 book are wiring related

Remember folks, in China, RnD stands for Receive and Duplicate!