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This is what I think the problem is, the diode in the ABS ECU, I will take it apart and see. https://www.steelsoldiers.com/showthread.php?114744-M939-ABS-ECU-failure-point

Plugged back in the ABS ecu plug, and unplugged the front 3-wire abs unit, and the short at the 15 amp fuse returned. Am I doing this right? I then unplugged the rear abs module too, the short is still there. Is the short in the ABS ECU or downstream somewhere? Sent from my iPhone using...

Never mind, I’m an idiot, I was thinking front wheels had a abs unit too Sent from my iPhone using Tapatalk

Abs* module Sent from my iPhone using Tapatalk

This is probably a stupid question, but where is the front and module? I can’t find it... Sent from my iPhone using Tapatalk

The horn is still sounding even with no 15amp fuse, and the ground at the base of the steering column unhooked. But does not sound when #25 is unhooked. Sent from my iPhone using Tapatalk

So I went back this morning and started troubleshooting. The alternator this morning was performing fine, in the middle of the green, so I didn't mess with it for now. But I did order the new delco alternator, J180 short bracket, "used" PCB box, and am currently working on a ABS module, so I...

No I did not... Sent from my iPhone using Tapatalk

I know the system wasn't charging before I pulled the PCB off, so maybe I messed something up when I did.

Well crap... I pulled the PCB board off, realized I couldn't get in the thing without cutting it open. So I was going to try your last advice and check out that fuse power. I reinstalled the PCB, then fired up the engine and checked the voltage at the fuse, which was blown again. It was...

Wow, thanks for all that, I’m looking into the PCB now, then the abs modules. My alternator does show charging when the truck is running. Sent from my iPhone using Tapatalk

Also I tried running the P2P program, but i'm stuck on a mac, so i'm going to have to work on a work around to get that running.

Thanks for the info. I seemed to have opened a can of worms, because now the CTIS is also acting up, I hear the system start making noise in the cab, like it wants to add pressure to the tires, but no air pressure is leaving the air tank like before. And the airline from the compressor going...

Hey there everybody, I just recently purchased a M925A2, and have been having some fun with it, but now i've run into a problem... While driving, my dog was sitting next to me, and when I hit the brakes, he started to slide off the seat, and braced himself by putting his paw on the dash. This...